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Private Data Stroge - Round 2
Raw
gistfile1.txt
⏺ You're right — I was stuck in the wrong substrate model. Let me course-correct.
★ Insight ─────────────────────────────────────
- I was treating "state tree" as the private-data substrate and "EVM contract storage" as the public-data substrate, as if Sub-project A's
fabric didn't apply here. It does apply. The state tree is a content-addressed key-value store with on-chain root commitments — it has nothing
inherently private about it. Encrypted leaves = private data (Sub-project A's SecretsRegistry); plaintext leaves = public data (Sub-project B's
artifacts). The substrate is the same, only leaf encryption differs.
- On-chain, we only ever need the hash + root commitments. For a specific task, NewtonPolicy.policyCodeHash already commits to the Rego bytes —
any fetcher verifies keccak256(bytes) == policyCodeHash and that closes the integrity loop regardless of where bytes live. For registry-level
questions ("is this plugin still approved?"), the 120s BLS-signed state root + inclusion proof does the job. SSTORE2 never enters the picture
because EVM itself never consumes the bytes.
- This collapses Sub-project B's infrastructure cost dramatically. The state-tree + EigenDA + BLS-commit + bootnode + gateway-orchestration
fabric is already being built in Sub-project A. Sub-project B adds more registries on top of that fabric — different data types, different leaf
semantics, but the same plumbing. It's additive, not a parallel track.
─────────────────────────────────────────────────
Corrected model — where each thing lives
┌──────────────────────────────┬────────────────────────────────────────────────┬────────────────────────────┬────────────────────────────┐
│ What │ Where │ Who writes │ Who reads │
├──────────────────────────────┼────────────────────────────────────────────────┼────────────────────────────┼────────────────────────────┤
│ keccak256(rego_bytes) → Rego │ Operator-local state tree (plaintext leaf), │ Gateway-orchestrated │ Operators / challengers / │
│ source │ backed by EigenDA delta blob │ operator broadcast on │ SP1 prover, via signed RPC │
│ │ │ policy deploy │ + inclusion proof │
├──────────────────────────────┼────────────────────────────────────────────────┼────────────────────────────┼────────────────────────────┤
│ keccak256(schema_bytes) → │ │ │ Same — signed RPC from │
│ data.params / data.wasm │ Same — state tree leaf │ Same flow │ operator │
│ schema │ │ │ │
├──────────────────────────────┼────────────────────────────────────────────────┼────────────────────────────┼────────────────────────────┤
│ keccak256(wasm_bytes) → WASM │ Same — state tree leaf (MB-scale leaf is fine; │ Same │ Same │
│ plugin binary │ redb handles arbitrary value sizes) │ │ │
├──────────────────────────────┼────────────────────────────────────────────────┼────────────────────────────┼────────────────────────────┤
│ │ Per-registry BLS-signed state root, committed │ │ EVM — used for │
│ On-chain commitment │ every 120s to the registry contract │ Operator quorum (same as │ inclusion-proof │
│ │ (implementing IStateRootCommittable) │ Sub-project A) │ verification in challenge │
│ │ │ │ paths │
├──────────────────────────────┼────────────────────────────────────────────────┼────────────────────────────┼────────────────────────────┤
│ │ NewtonPolicy.policyCodeHash continues to point │ │ SP1 circuit / challenger / │
│ Existing on-chain hashes │ at the registered Rego hash; NewtonPolicyData │ Policy deployer │ operator (already the │
│ │ gets a wasmHash field replacing wasmCid │ │ four-site commitment │
│ │ │ │ pattern) │
└──────────────────────────────┴────────────────────────────────────────────────┴────────────────────────────┴────────────────────────────┘
What goes on-chain: hashes (as they already do via policyCodeHash) + per-registry state roots + registry metadata (deprecation flags, deploy
timestamps). That's it.
What goes in operator state + EigenDA: the actual bytes.
What disappears: IPFS dependency, SSTORE2, MB-scale EVM storage cost. The "on-chain" guarantee in the brief is satisfied by the committed state
root, not by bytes-in-EVM.
What I was misunderstanding
I was holding onto the EVM smart-contract analogy from your brief ("like how smart contracts are deployed/stored onchain") too literally —
treating it as "bytes physically in contract code." You were using it as "protocol-committed content with on-chain trust anchors, fetchable
from the protocol without external dependency." Under that second reading (which is actually what the brief requires), the state-tree substrate
is a cleaner fit than SSTORE2.
What this resolves
- Q3 (storage substrate): state tree on the Sub-project A fabric, not SSTORE2. Applies uniformly to all four artifacts.
- E5 for all four: confirmed — this is literally what the state-tree read path does (gateway-orchestrated for writes, operator signed-RPC reads
for fetches, EigenDA as the blob-availability layer for snapshot/replay).
- Q2 (addressing): content-hash remains the primary key. In state-tree terms: the tree key is the content hash.
- Privacy extension (R5): free — encrypted leaves work the same as SecretsRegistry. The on-chain registry stores (cleartext_hash,
TEE_attestation_requirement_flag) in its metadata; the leaf stores ciphertext.
- Infrastructure reuse: Sub-project B becomes "three or four more IStateRootCommittable registries" (RegoRegistry + SchemaRegistry(ies) +
WasmPluginRegistry), reusing the state-tree crate, EigenDA client, bootnode, gateway orchestration, and BLS commit flow from Sub-project A
wholesale.
What opens up next
A few concrete decisions remain:
1. One registry vs several — single unified PolicyArtifactRegistry with typed entries (kind: Rego / Schema / WasmPlugin) sharing one state
root, or separate RegoRegistry / SchemaRegistry / WasmPluginRegistry each with its own state root? Sub-project A chose separate (Identity /
Confidential / Secrets) to keep trust boundaries clean. Same logic probably applies here.
2. Registry on which chain(s)? Sub-project A's three registries live on source chain (per your Linear issue decomposition). Policy artifacts
probably same — but worth confirming because destination-chain challengers need to verify artifact presence too, which means either dest-chain
registries or cross-chain root relay.
3. State-root commit cadence for artifact registries — Sub-project A uses 120s across all three registries. Do we lock-step all six+ registries
(Sub-project A's three + Sub-project B's new ones) at the same 120s cadence? It simplifies operators' commit loop significantly.
4. Model X vs Model Y for WASM leaves — leaf stores bytes directly (X), or leaf stores metadata + EigenDA blob pointer (Y)? Model X makes state
tree a single source of truth but grows the tree storage footprint; Model Y keeps the tree light but adds a fetch indirection. Sub-project A
uses Model X for identity/confidential data (KB-scale leaves); for MB-scale WASM, Y might be preferable.
Which of these do you want to dig into first? Q4 (single vs several registries) feels like the most foundational — it decides the on-chain
contract surface and the trust boundaries between artifact kinds.
✻ Baked for 2m 14s
❯ 1. what do you recommend? any reason or benefits for splitting? 2. in subproject A, were registries on each chain not just on source chain? 3.
yes, I think 120s loop is okay, definitely to reduce complexity in phase 1 4. we curerntly limit wasm binary size (data provider config),
from the protocol without external dependency." Under that second reading (which is actually what the brief requires), the state-tree substrate
is a cleaner fit than SSTORE2.
What this resolves
- Q3 (storage substrate): state tree on the Sub-project A fabric, not SSTORE2. Applies uniformly to all four artifacts.
- E5 for all four: confirmed — this is literally what the state-tree read path does (gateway-orchestrated for writes, operator signed-RPC reads
for fetches, EigenDA as the blob-availability layer for snapshot/replay).
- Q2 (addressing): content-hash remains the primary key. In state-tree terms: the tree key is the content hash.
- Privacy extension (R5): free — encrypted leaves work the same as SecretsRegistry. The on-chain registry stores (cleartext_hash,
TEE_attestation_requirement_flag) in its metadata; the leaf stores ciphertext.
- Infrastructure reuse: Sub-project B becomes "three or four more IStateRootCommittable registries" (RegoRegistry + SchemaRegistry(ies) +
WasmPluginRegistry), reusing the state-tree crate, EigenDA client, bootnode, gateway orchestration, and BLS commit flow from Sub-project A
wholesale.
What opens up next
A few concrete decisions remain:
1. One registry vs several — single unified PolicyArtifactRegistry with typed entries (kind: Rego / Schema / WasmPlugin) sharing one state
root, or separate RegoRegistry / SchemaRegistry / WasmPluginRegistry each with its own state root? Sub-project A chose separate (Identity /
Confidential / Secrets) to keep trust boundaries clean. Same logic probably applies here.
2. Registry on which chain(s)? Sub-project A's three registries live on source chain (per your Linear issue decomposition). Policy artifacts
probably same — but worth confirming because destination-chain challengers need to verify artifact presence too, which means either dest-chain
registries or cross-chain root relay.
3. State-root commit cadence for artifact registries — Sub-project A uses 120s across all three registries. Do we lock-step all six+ registries
(Sub-project A's three + Sub-project B's new ones) at the same 120s cadence? It simplifies operators' commit loop significantly.
4. Model X vs Model Y for WASM leaves — leaf stores bytes directly (X), or leaf stores metadata + EigenDA blob pointer (Y)? Model X makes state
tree a single source of truth but grows the tree storage footprint; Model Y keeps the tree light but adds a fetch indirection. Sub-project A
uses Model X for identity/confidential data (KB-scale leaves); for MB-scale WASM, Y might be preferable.
Which of these do you want to dig into first? Q4 (single vs several registries) feels like the most foundational — it decides the on-chain
contract surface and the trust boundaries between artifact kinds.
✻ Baked for 2m 14s
❯ 1. what do you recommend? any reason or benefits for splitting? 2. in subproject A, were registries on each chain not just on source chain? 3.
yes, I think 120s loop is okay, definitely to reduce complexity in phase 1 4. we curerntly limit wasm binary size (data provider config),
and would it be possible to implement pruning? so that old wasm binaries can be deleted
}
// Append qScore to your output
{"systemMessage": "[Token Optimizer] Possible retry loop: 5 similar short results in recent tool calls. The same approach may keep
failing."}
⎿  Read .claude/rules/error-selectors.md (24 lines)
⎿  Read .claude/rules/incidents-inbox.md (24 lines)
⎿  Read .claude/rules/agent-guide.md (137 lines)
⎿  Read .claude/rules/git-hygiene.md (52 lines)
⎿  Read .claude/rules/CLAUDE.md (7 lines)
⎿  Skills restored (superpowers:brainstorming, save-progress, commit-git, grill-me, pr, docs-sync, superpowers:writing-plans)
❯ continue
⏺ I'll resume by grounding the grill-me interview in the actual spec, then fire the first adversarial question at the highest-risk unresolved
branch.
Read 1 file, listed 1 directory (ctrl+o to expand)
⏺ Let me read the spec's structure and the plan's stream layout in parallel to ground the grill.
Searched for 4 patterns (ctrl+o to expand)
⏺ Let me load the adversarial attack surfaces — slashing seam, lock-step commits, and hash-chain property — in parallel.
Read 1 file (ctrl+o to expand)
⎿  PreToolUse:Read hook error ⎿  Failed with non-blocking status code: [TokenEfficiency] Hard rule
violation: Re-reading PRIVATE_DATA_STORAGE.md (2x) — file unchanged
since last read. Consider using cached knowledge.
⎿  PreToolUse:Read hook error ⎿  Failed with non-blocking status code: [TokenEfficiency] Hard rule
violation: Re-reading PRIVATE_DATA_STORAGE.md (2x) — file unchanged
since last read. Consider using cached knowledge.
⎿  Loaded docs/CLAUDE.md
⏺ I have enough grounding now. Before firing, one last check on the upload flow because the biggest adversarial question hinges on who validates
writes end-to-end — gateway or each operator.
Read 1 file (ctrl+o to expand)
⎿  PreToolUse:Read hook error ⎿  Failed with non-blocking status code: [TokenEfficiency] Hard rule
violation: Re-reading PRIVATE_DATA_STORAGE.md (2x) — file unchanged
since last read. Consider using cached knowledge.
⏺ Grounded. Kicking off the grill. I'll start at the most expensive-to-unwind branch: the write-authorization gap in §9.1 that undermines the
§S.3 "no bad commit" claim.
★ Insight ─────────────────────────────────────
- §9.1 shows the gateway as the sole validator of the upload signature — operators fetch the EigenDA delta and apply it blindly. §8.1's
delta_blob.writes = [(leaf_key, leaf_value_hpke), ...] carries no per-write witness.
- §S.3's "divergent JMT caught at BLS quorum boundary" only stops operator equivocation. When a byzantine gateway forges a write, every honest
operator applies the same forged delta and computes the same bad root — BLS aggregates cleanly, commit lands on-chain, §2's "Gateway MUST NOT
modify private data" invariant becomes unverifiable.
- This exact pattern bit the codebase before: the permissionless grantClient() lesson on ConfidentialDataRegistry — any one-sided write that
skips the counterpart's signature is an authorization hole. The state-tree migration inherits the same failure class unless client signatures
ride in the delta.
─────────────────────────────────────────────────
---
Q1 — Write authorization: who verifies the client signature, and where?
Adversarial framing. §2 says "Gateway ... MUST NOT modify private data" and §S.2 calls gateway memory ephemeral — both state the property but
neither proves it. §9.1's write path has operators ingesting a blob that contains (leaf_key, leaf_value_hpke) tuples with no per-write
authorization witness. The client signature stops at the gateway.
Concrete attack. A byzantine gateway (compromise of one machine, single key) appends a forged write to an otherwise-honest batch — e.g.,
leaf_key = sha256("identity/link" || victim_user || attacker_policy_client) with a valid-looking HPKE ciphertext. The gateway posts the blob to
EigenDA, broadcasts the delta, honest operators apply it (they have no way to reject: the delta is authenticated as "from the gateway", not
"from each individual uploader"), every honest operator computes the same root, quorum BLS aggregates, commitStateRoot succeeds. The victim now
has a linkage leaf they never authorized — and the challenger's full-replica check also accepts it, because the state is internally consistent
(delta → root chain is unbroken).
Why this is more expensive to fix later. Adding the witness post-MVP forces a wire-format change to the delta blob (every EigenDA blob already
published gets re-ingested under new rules), a contract-level schema change if we want on-chain witness verification, and a challenger replay
rewrite. If we ship it into the first clean cutover, it's free.
My recommended answer. Three things must land together in Phase 1:
1. Delta blob carries per-write witnesses. Change §8.1 to:
writes: [(leaf_key, leaf_value_hpke, auth_witness), ...]
auth_witness = {
write_kind: {identity_self | identity_link | confidential_data | confidential_grant_propose | confidential_grant_accept | secrets_write},
signer: Address, // derived from sig recovery, MUST match the kind's required role
nonce: u64, // per-signer, strictly monotonic — prevents replay
sig: ECDSA_sig_over(keccak256(write_kind || leaf_key || leaf_value_hpke || nonce || subtree_id || chain_id)),
}
2. Operators independently verify each witness at apply time, rejecting the entire delta if any witness fails. Verification is deterministic so
all honest operators agree. Same rule-set at both (a) operator ingest and (b) challenger replay.
3. Per-signer nonces live in the JMT itself as a side-subtree (nonce_key = sha256("nonce" || signer), leaf = u64). This makes replay detection
part of the committed state, so challengers catch replay without a side database.
Consequence if we pass on this. §S.3's "no bad commit can reach on-chain" is demoted from a cryptoeconomic guarantee to a gateway-operational
promise. Weak-mode reads (§S.11) become even weaker because the residual attack surface grows from "byzantine operator signs a content_hash
that was never committed" to "byzantine gateway commits any content_hash it wants". The Phase 1 detection-only challenger has nothing to
detect: the state is self-consistent.
Question. Is per-write client-signature propagation into the delta blob — with mandatory operator-side verification before JMT apply — in scope
for Phase 1, or have I missed a spec section where operators already re-verify the upload-time signature? I did not find it in §§8-9; if it
lives in one of the Stream A/B plan tasks I skipped, point me at the task ID.
✻ Churned for 3m 48s
※ recap: Grilling the Sub-project A private-data-storage design adversarially; currently on Q1 — whether per-write client signatures ride in the
EigenDA delta blob so operators (not just the gateway) authorize writes. Next: your answer on Q1 so I can move to the next branch. (disable
recaps in /config)
❯ that is a valid point: we should add witnesses upload verification
⏺ Logged: Q1 resolved → per-write witnesses + operator-side verification land in Phase 1. I'll hand this to /save-progress or an inbox entry at
the end so the forked implementation session picks it up before Stream A lands; for now keeping it in the interview thread.
Walking down the tree. The witness change is contained to §8.1 delta format + operator apply logic. Moving on.
★ Insight ─────────────────────────────────────
- Ethereum transactions are atomic within a contract, not across contracts. The §6.3 claim "operators MUST roll back logically and retry all
three" treats three independent on-chain state machines as one, but a mined tx on two registries cannot be unmined when the third reverts.
- §R.5's own rationale for three-tree split is "each can be upgraded, paused, or rotated independently". Lock-step sequence numbers contradict
that rationale — they re-couple the very registries §R.5 deliberately separated.
- §6.4's combined root is already an observer-derived artifact, not on-chain. We already accept that external observers stitch three roots
together; lock-stepping the sequence numbers gives them no additional property they don't already have.
─────────────────────────────────────────────────
---
Q2 — Lock-step commits under partial on-chain failure
Adversarial framing. §6.3 mandates "The gateway MUST post three transactions per commit boundary — one per registry — at the same sequenceNo.
If any registry transaction reverts … operators MUST roll back logically and retry all three at the next commit boundary with the same
next-sequenceNo."
The failure mode. Gateway posts three txs for sequenceNo=17. Base fee spikes, or one registry is paused via the Phase 1.5 pauseCommits
(§F.1.1), or one tx is reorged out on one chain during a shallow reorg. Two land, one reverts. Now:
┌──────────────┬───────────────────┬──────────────────┐
│ Registry │ currentSequenceNo │ currentStateRoot │
├──────────────┼───────────────────┼──────────────────┤
│ Identity │ 17 │ root_I_17 │
├──────────────┼───────────────────┼──────────────────┤
│ Confidential │ 17 │ root_C_17 │
├──────────────┼───────────────────┼──────────────────┤
│ Secrets │ 16 │ root_S_16 │
└──────────────┴───────────────────┴──────────────────┘
Next boundary the gateway tries sequenceNo=17 for Secrets (fine) and sequenceNo=18 for the other two (fine). But the spec literal says "retry
all three at the next commit boundary with the same next-sequenceNo" — which is self-contradictory: Identity/Confidential are already past 17,
Secrets hasn't reached it. There is no single "next-sequenceNo" across all three.
Trying to enforce lock-step in the face of this requires one of:
1. Abort-and-resubmit: don't commit any of the three until all three will succeed. Requires a coordinator contract (TripleCommit.commitAll(c_I,
c_C, c_S, sig_I, sig_C, sig_S)), which reintroduces the exact coupling §R.5 rejected and adds a contract with gas-atomicity risk of its own.
2. Pause-the-leaders: the two registries that advanced to 17 pause new commits (via §F.1.1) until Secrets catches up. Requires pauseCommits to
exist in Phase 1, which §F.1.4 defers to Phase 1.5. Also burns the fast-halt circuit breaker's clean semantic.
3. Admit divergence: registries advance independently. Observers reading a snapshot of the combined root stitch together "Identity@latest ||
Confidential@latest || Secrets@latest" — exactly what §6.4 already describes.
Knock-on effects of keeping lock-step:
- §F.1.1 pauseCommits becomes per-registry OR global. If it's per-registry (as written), pausing one registry forces the other two to stop
advancing too. If it's global, we've collapsed three isolated pausable registries into one logical unit — contradicting §R.5 again.
- Sub-project C's task-response chain will want to reference "private-data state as of task T". If task T lands between Identity@17 and
Confidential@17 boundaries, what root does it pin? Lock-step says this never happens, but the partial-failure case breaks that. Independent
sequence numbers force Sub-project C to pin three roots, which is more work but reflects the truth.
- Challenger replay already handles per-registry sequence progression (§15 checks each registry independently). Dropping lock-step removes a
phantom invariant the challenger never actually depended on.
- EigenDA delta blobs are already per-subtree (§8.1 subtree_id field). Gateway already publishes three blobs. The lock-step claim lives only in
the commit-posting step.
My recommended answer. Drop the lock-step requirement. Replace §6.3 with:
scope for Phase 1, or have I missed a spec section where operators
already re-verify the upload-time signature? I did not find it in
§§8-9; if it lives in one of the Stream A/B plan tasks I skipped,
point me at the task ID.
✻ Churned for 3m 48s
※ recap: Grilling the Sub-project A private-data-storage design
adversarially; currently on Q1 — whether per-write client signatures
ride in the EigenDA delta blob so operators (not just the gateway)
authorize writes. Next: your answer on Q1 so I can move to the next
branch. (disable recaps in /config)
❯ that is a valid point: we should add witnesses upload verification
⏺ Logged: Q1 resolved → per-write witnesses + operator-side verification
land in Phase 1. I'll hand this to /save-progress or an inbox entry
at the end so the forked implementation session picks it up before
Stream A lands; for now keeping it in the interview thread.
Walking down the tree. The witness change is contained to §8.1 delta
format + operator apply logic. Moving on.
★ Insight ─────────────────────────────────────
- Ethereum transactions are atomic within a contract, not across
contracts. The §6.3 claim "operators MUST roll back logically and
retry all three" treats three independent on-chain state machines as
one, but a mined tx on two registries cannot be unmined when the third
reverts.
- §R.5's own rationale for three-tree split is "each can be upgraded,
paused, or rotated independently". Lock-step sequence numbers
contradict that rationale — they re-couple the very registries §R.5
deliberately separated.
- §6.4's combined root is already an observer-derived artifact, not
on-chain. We already accept that external observers stitch three roots
together; lock-stepping the sequence numbers gives them no additional
property they don't already have.
─────────────────────────────────────────────────
---
Q2 — Lock-step commits under partial on-chain failure
Adversarial framing. §6.3 mandates "The gateway MUST post three
transactions per commit boundary — one per registry — at the same
sequenceNo. If any registry transaction reverts … operators MUST roll
back logically and retry all three at the next commit boundary with
the same next-sequenceNo."
The failure mode. Gateway posts three txs for sequenceNo=17. Base fee
spikes, or one registry is paused via the Phase 1.5 pauseCommits
(§F.1.1), or one tx is reorged out on one chain during a shallow
reorg. Two land, one reverts. Now:
┌──────────────┬───────────────────┬──────────────────┐
│ Registry │ currentSequenceNo │ currentStateRoot │
├──────────────┼───────────────────┼──────────────────┤
│ Identity │ 17 │ root_I_17 │
├──────────────┼───────────────────┼──────────────────┤
│ Confidential │ 17 │ root_C_17 │
├──────────────┼───────────────────┼──────────────────┤
│ Secrets │ 16 │ root_S_16 │
└──────────────┴───────────────────┴──────────────────┘
Next boundary the gateway tries sequenceNo=17 for Secrets (fine) and
sequenceNo=18 for the other two (fine). But the spec literal says
"retry all three at the next commit boundary with the same
next-sequenceNo" — which is self-contradictory: Identity/Confidential
are already past 17, Secrets hasn't reached it. There is no single
"next-sequenceNo" across all three.
Trying to enforce lock-step in the face of this requires one of:
1. Abort-and-resubmit: don't commit any of the three until all three
will succeed. Requires a coordinator contract
(TripleCommit.commitAll(c_I, c_C, c_S, sig_I, sig_C, sig_S)), which
reintroduces the exact coupling §R.5 rejected and adds a contract with
gas-atomicity risk of its own.
2. Pause-the-leaders: the two registries that advanced to 17 pause new
commits (via §F.1.1) until Secrets catches up. Requires pauseCommits
to exist in Phase 1, which §F.1.4 defers to Phase 1.5. Also burns the
fast-halt circuit breaker's clean semantic.
3. Admit divergence: registries advance independently. Observers
reading a snapshot of the combined root stitch together
"Identity@latest || Confidential@latest || Secrets@latest" — exactly
what §6.4 already describes.
Knock-on effects of keeping lock-step:
- §F.1.1 pauseCommits becomes per-registry OR global. If it's
per-registry (as written), pausing one registry forces the other two
to stop advancing too. If it's global, we've collapsed three isolated
pausable registries into one logical unit — contradicting §R.5 again.
- Sub-project C's task-response chain will want to reference
"private-data state as of task T". If task T lands between Identity@17
and Confidential@17 boundaries, what root does it pin? Lock-step says
this never happens, but the partial-failure case breaks that.
Independent sequence numbers force Sub-project C to pin three roots,
which is more work but reflects the truth.
- Challenger replay already handles per-registry sequence progression
(§15 checks each registry independently). Dropping lock-step removes a
phantom invariant the challenger never actually depended on.
- EigenDA delta blobs are already per-subtree (§8.1 subtree_id field).
Gateway already publishes three blobs. The lock-step claim lives only
in the commit-posting step.
My recommended answer. Drop the lock-step requirement. Replace §6.3
2. Pause-the-leaders: the two registries that advanced to 17 pause new commits (via §F.1.1) until Secrets catches up. Requires pauseCommits to
exist in Phase 1, which §F.1.4 defers to Phase 1.5. Also burns the fast-halt circuit breaker's clean semantic.
3. Admit divergence: registries advance independently. Observers reading a snapshot of the combined root stitch together "Identity@latest ||
Confidential@latest || Secrets@latest" — exactly what §6.4 already describes.
Knock-on effects of keeping lock-step:
- §F.1.1 pauseCommits becomes per-registry OR global. If it's per-registry (as written), pausing one registry forces the other two to stop
advancing too. If it's global, we've collapsed three isolated pausable registries into one logical unit — contradicting §R.5 again.
- Sub-project C's task-response chain will want to reference "private-data state as of task T". If task T lands between Identity@17 and
Confidential@17 boundaries, what root does it pin? Lock-step says this never happens, but the partial-failure case breaks that. Independent
sequence numbers force Sub-project C to pin three roots, which is more work but reflects the truth.
- Challenger replay already handles per-registry sequence progression (§15 checks each registry independently). Dropping lock-step removes a
phantom invariant the challenger never actually depended on.
- EigenDA delta blobs are already per-subtree (§8.1 subtree_id field). Gateway already publishes three blobs. The lock-step claim lives only in
the commit-posting step.
My recommended answer. Drop the lock-step requirement. Replace §6.3 with:
▎ The gateway SHOULD post three transactions per 120-second commit boundary — one per registry. Each commit is independent: a revert on one
▎ registry does not roll back the others. The reverted registry retries on the next commit boundary with its own next-sequenceNo.
▎ Observer-derived combined roots (§6.4) MUST be computed over (currentStateRoot, currentSequenceNo, lastCommitTimestamp) triples fetched
▎ independently per registry; no "global" sequence number exists.
Add a small §6.6 noting that for Sub-project C task-response anchoring, each task pins (sequenceNo, stateRoot) per subtree it reads from — not
a single global root. This is extra bookkeeping but it's truth-preserving, whereas lock-step is a claim we can't enforce.
What this buys us. The §F.1.1 circuit breaker can be per-registry without forcing the other two to halt. §F.1.2 queued rotations are naturally
per-registry already. The §15 challenger's re-verify every commit loop already iterates per-registry. Partial on-chain failure becomes "one
registry is one commit behind" instead of "three registries are in an impossible state".
What it costs. Sub-project C has to carry three anchors per task instead of one. Operators and challengers need to track three independent
sequence cursors instead of one. External dashboards show three progress indicators instead of one. All small.
Alternative I'd reject. Adding a coordinator contract (TripleCommit) pulls us back toward §R.5's rejected single-tree model — same gas cost,
worse isolation, new atomicity bug class.
Question. Do we drop §6.3's lock-step and let registries advance independently, or is there a load-bearing reason for the lock-step that I'm
not seeing (maybe a Sub-project C constraint not yet specified, or a gas-saving batch path on the commit side)? If yes to drop, I'll mark it
and move to the next branch — which will be HPKE non-determinism in the write path.
✻ Baked for 1m 33s
❯ let's revisit the having 3 registries: what does having 3 registries give us in the first place? should we just have 1?
⏺ Good pivot — Q2 is downstream of this choice, so let me step up and pressure-test the "three registries" decision on its own terms. If the
answer is option C (unified), Q2 evaporates; if it's option B (one contract, three slots), Q2 still resolves cleanly; if it's A (status quo
three contracts), we still need Q2.
★ Insight ─────────────────────────────────────
- §R.5 gives three reasons for splitting, but only one of them (per-subtree OPERATOR_SET_ID for differential quorum thresholds) is
load-bearing. The other two — independent pause, smaller proofs — don't hold up under stress.
- The usually-missed middle option is one contract, three state-root slots — preserves per-subtree quorum flexibility, drops three audit
surfaces to one, and gives independent sequence advancement for free. §R.5 framed the choice as binary (three contracts vs one unified tree)
and skipped this.
- JMT domain separation already lives in the key prefix (sha256("identity/link"||...) vs sha256("secrets"||...)), so "three trees" vs "one tree
with prefixed keys" is a structural choice, not a correctness choice — the cryptographic separation is the same either way.
─────────────────────────────────────────────────
---
What three registries actually buy (§R.5 audit)
Spec lists three benefits. Rating each on honesty:
┌────────────────────────────┬────────────────┬───────────────────────────────────────────────────────────────────────────────────────────┐
│ §R.5 claim │ Real weight │ Why │
├────────────────────────────┼────────────────┼───────────────────────────────────────────────────────────────────────────────────────────┤
│ Independent on-chain │ │ Pause-one-but-not-others is mostly theater. Clients upload composite sets (identity + │
│ registries — upgrade, │ Weak │ confidential linkage); if one half pauses, the client has to handle partial writes │
│ pause, rotate │ │ anyway. Upgrade/rotate is a governance motion that in practice moves all three together. │
├────────────────────────────┼────────────────┼───────────────────────────────────────────────────────────────────────────────────────────┤
│ Per-subtree │ Strong — the │ Lets a Phase-2 design require a higher quorum threshold for secrets (higher │
│ OPERATOR_SET_ID (§Q.1) │ only real one │ value-at-risk) than for identity. Once you pick a unified tree, you can never split the │
│ │ │ quorum threshold later — one root, one BLS signature, all-or-nothing. │
├────────────────────────────┼────────────────┼───────────────────────────────────────────────────────────────────────────────────────────┤
│ Smaller proofs per read │ Negligible │ Unified JMT adds log₁₆(3) ≈ 1 nibble level. 224 B → ~230 B. Noise. │
└────────────────────────────┴────────────────┴───────────────────────────────────────────────────────────────────────────────────────────┘
Actual cost of the three-contract status quo (not in §R.5):
- 3× commit tx gas × N chains × 30 commits/hr (the one §R.5 admits)
- 3× contract audit surface
- 3× upgrade governance path
- 3× BLS verify on-chain per boundary
- Lock-step coordination bug class (the Q2 thread we just opened)
- 3× NewtonAddressesProvider slots to keep in sync
- 3× cold-storage currentStateRoot duplication
---
Three candidate architectures
A. Status quo — three registries, three JMTs, three contracts. What the spec says today. Carries Q2's lock-step problem and full triple audit
cost.
B. One StateRegistry contract, three JMTs, three independent state-root slots. Single contract, single upgrade path, single audit, but three
fully independent (sequenceNo, stateRoot, lastCommitTimestamp) slots keyed by subtree_id ∈ {identity, confidential, secrets}. Each slot
advances on its own commit tx. OPERATOR_SET_ID becomes mapping(uint8 subtree_id => uint32 operator_set_id) — §Q.1 flexibility preserved.
pauseCommits becomes mapping(uint8 => bool) — still per-subtree pausable.
contract StateRegistry is AddressesProviderConsumer, IStateRootCommittable {
mapping(uint8 => bytes32) public stateRoots;
mapping(uint8 => uint64) public sequenceNos;
mapping(uint8 => uint64) public lastCommitTimestamps;
mapping(uint8 => uint32) public operatorSetIds;
mapping(uint8 => bool) public paused;
function commitStateRoot(uint8 subtreeId, StateCommit calldata c, bytes calldata blsCertificate) external;
}
Each subtree's commit is independent: revert on one does not touch the others. Q2 resolves as "there is no lock-step; each subtree is its own
state machine." Sub-project C pins (subtree_id, sequenceNo, stateRoot) triples for whichever subtrees its task reads — still three anchors but
from one contract read.
C. One registry, one unified JMT, one state root, one commit. Key-prefix domain separation is kept (sha256("identity"||...),
sha256("confidential/data"||...), etc.). One BLS verify per boundary. Forecloses differential OPERATOR_SET_ID. Smaller proofs lose ~10 B. Clean
but permanently locks the quorum threshold across all three data kinds — cannot separate "user identity attestation" from "WASM secrets" at
the cryptoeconomic layer ever again.
---
My recommended answer: B
Primary reasons:
1. Preserves §Q.1 optionality. Per-subtree OPERATOR_SET_ID as a mapping field — cheap at contract level, zero foreclosure. Deferring the Q.1
decision to Phase 2 (as spec does) is safe only under B/A; C kills the option forever.
2. Dissolves Q2 structurally. Independent slots means a reverted commit on one subtree never strands the others. §6.3's lock-step becomes a
delete, not a rewrite.
3. Drops the 3× audit burden without losing the 3× JMT independence benefits. One Solidity audit, one upgrade story, one
NewtonAddressesProvider slot.
4. Per-subtree pause cleanly implementable via mapping(uint8 => bool) — §F.1.1 circuit breaker can target one subtree without a separate
contract.
5. Single-hop read for observers. External auditors computing the combined root (§6.4) do it via one getStateRoots() view call returning a
struct of three, not three separate contract calls. Nicer for Sub-project C.
Tradeoffs I accept:
- Still 3× on-chain commit gas — unchanged from A. If the goal is gas savings, only C delivers, and C costs us §Q.1.
- Still 3× BLS verify — unavoidable as long as per-subtree OPERATOR_SET_ID is a real option, because differential quorums require separate
signatures.
- One contract is a bigger blast-radius on a bug — but 1-contract-well-audited beats
3-contracts-structurally-identical-but-each-only-gets-shallow-review-time.
When I'd pick C instead. If you're willing to firmly commit now that all three subtrees will share quorum thresholds forever (Phase 1, Phase 2,
Phase 3), C is strictly better on gas and operational simplicity. But "forever" is the load-bearing word, and the current spec leaves §Q.1
explicitly open. Choosing C here silently answers §Q.1 in a way that can never be walked back.
When I'd pick A. Only if there's an EigenLayer or on-chain-middleware constraint that forces one contract = one OPERATOR_SET_ID (I don't think
there is — verifyCertificate(messageHash, sig, operatorSetId) takes the ID as an arg and should accept per-call values). If such a constraint
exists, B collapses into A mechanically.
---
Question. Do we move to B (one contract, three independent slots) as the Phase 1 architecture, preserving §Q.1 for Phase 2?
Bringing this back to Sub-project A's plan: B means rewriting Stream B's contract tasks (B1-B4) from "three parallel contracts" to "one
multi-slot contract", and dropping §6.3 lock-step from Stream A/X entirely. Stream A (state-tree crate) and Stream D (challenger) are
unaffected — they already iterate per-subtree. I want your call before I keep walking the tree, because the next few branches (commit message
binding, per-slot BLS cert passing, pause semantics) all hang on this answer.
✻ Cogitated for 1m 51s
❯ Let's choose C: lock in. firmly commit now that all three subtrees will share quorum thresholds forever (Phase 1, Phase 2,
Phase 3), C is strictly better on gas and operational simplicity.
⏺ Locked. C: one registry, one JMT, one state root, one commit, shared quorum threshold across identity/confidential/secrets forever. §Q.1
resolved as "single operator set". I'll enumerate the spec+plan diffs at interview end so the forked session has a clean migration delta.
★ Insight ─────────────────────────────────────
- HPKE SEAL is non-deterministic — it generates a fresh ephemeral X25519 key per call, so the same plaintext sealed twice produces two
different ciphertexts. If two actors on the write path ever seal independently, their leaf bytes differ, their JMT leaf digests differ, their
roots differ, and BLS aggregation fails silently — the system goes "no commit this boundary" with no explanation of why.
- §5's leaf_value = HPKE-encrypted X is silent on who seals and who are the recipient keys. Under a unified tree (Option C), this ambiguity
hurts more: one divergent seal poisons the single root, not just one of three.
- The Newton codebase has hit this class before: the positionally-aligned arrays must never use continue on failure lesson. Same pattern —
independent actors producing data under non-determinism, one diverges, the aggregate is garbage. The lesson prescribes "clear and break"
(contribute zero); here the architectural fix is "one seal, one authoritative ciphertext".
─────────────────────────────────────────────────
---
Q3 — HPKE seal authorship and recipient-key binding under a unified tree
Adversarial framing. §5 specifies leaf values are HPKE-encrypted but does not say who performs the seal or to which keys. §9.1's write path
shows C->>GW: signed upload — the payload isn't typed. Three possible architectures live under this ambiguity, each with radically different
failure modes.
The three candidate seal owners
┌───────────────┬─────────────────┬─────────────────┬─────────────────────────────┬──────────────────────────────────────────────────────┐
│ Who seals │ What the client │ Gateway sees │ Deterministic at operators? │ Notes │
│ │ uploads │ plaintext? │ │ │
├───────────────┼─────────────────┼─────────────────┼─────────────────────────────┼──────────────────────────────────────────────────────┤
│ (i) Client │ ciphertext + │ No │ Yes — same ciphertext bytes │ Client must know all recipient HPKE pubkeys │
│ │ sig │ │ everywhere │ │
├───────────────┼─────────────────┼─────────────────┼─────────────────────────────┼──────────────────────────────────────────────────────┤
│ (ii) Gateway │ plaintext + sig │ Yes │ Yes — gateway seals once, │ Violates §2 trust model │
│ │ │ │ ships to operators │ │
├───────────────┼─────────────────┼─────────────────┼─────────────────────────────┼──────────────────────────────────────────────────────┤
│ (iii) Each │ │ │ No — N operators seal with │ Catastrophic: no two operators have matching │
│ operator │ plaintext + sig │ No (TLS only) │ N ephemeral keys │ leaf_value bytes → root diverges → BLS never │
│ │ │ │ │ aggregates │
└───────────────┴─────────────────┴─────────────────┴─────────────────────────────┴──────────────────────────────────────────────────────┘
Only (i) is safe. (ii) turns the gateway into a plaintext custodian and re-creates the V1 centralization that §R.7 explicitly rejects. (iii) is
deterministic-seal-violation — the same bug class as Newton's positionally-aligned arrays lesson.
If seal = client, then "recipient keys" has to be pinned
§5.1/§5.2 don't specify recipients; §5.3 says "encrypted to each operator's individual HPKE key" — plural. Under current privacy layer
semantics (bleed-in from PRIVACY.md), secrets are always per-operator-individual (because WASM decrypts during Prepare, pre-FROST), while
identity/confidential data can use the threshold MPK once DKG is active (Phase 2+). For Phase 1 MVP (no DKG), all three kinds have to be
per-operator-individual.
So the Phase 1 leaf_value shape is:
leaf_value_bytes = canonical_serialize({
recipients: [(operator_hpke_pubkey, ciphertext_for_that_key), ...],
recipient_set_hash: keccak256(sorted_operator_hpke_pubkeys), // binds the bundle to an operator set
scheme: "hpke-x25519-chacha20poly1305",
version: 1,
})
Canonical serialization must be bit-stable — bincode with fixed field order, operator pubkeys sorted by byte value before hashing. Any
non-determinism in this serialization reintroduces (iii) even though the seal itself was done once.
The rotation problem this exposes
Clients seal against a specific operator set. Between seal time and operator-apply time, the operator set can rotate: Op_A deregisters, Op_D
joins. Now:
- Existing leaf has ciphertexts for {A, B, C}.
- Current quorum is {B, C, D}.
- Op_D cannot decrypt this leaf at all — no ciphertext for its HPKE key exists.
Under the three-contract model this was per-subtree and tolerable. Under the unified tree (Option C), every read by a policy eval running on
Op_D hits this wall for every leaf sealed before its join. The blast radius grew.
Three ways to handle rotation:
1. Freeze and accept staleness. Leaves stay encrypted to the operator set at seal time. Op_D cannot serve historical leaves until the client
re-uploads. For low-cardinality data (identity, secrets), acceptable; for high-cardinality (confidential blacklists with 10K entries), brutal.
2. Re-seal on rotation. When operator set changes, someone re-encrypts every leaf for the new set. Someone = the client (unscalable) or a
privileged actor (reintroduces plaintext-seeing role, violates §2).
3. Proxy re-encryption or HPKE PSK re-wrap. New operator Op_D gets a re-wrap of each leaf via a cryptographic scheme that doesn't require
plaintext access. This is possible (proxy re-encryption, identity-based encryption) but adds heavy crypto machinery not currently in scope.
What the spec needs to pin in Phase 1
My recommended answer.
1. Seal = client, always. §9.1 uploads carry leaf_value_hpke bytes already sealed; gateway never sees plaintext; operators never re-seal. Add a
normative "MUST NOT re-encrypt" clause in §2 trust model.
2. Canonical bundle format (Phase 1):
leaf_value = bincode::serialize({
version: u8 = 1,
scheme: u8 = HPKE_X25519_CHACHA20POLY1305,
recipient_set_hash: [u8; 32], // keccak256 over sorted pubkeys, binds intended set
recipients: BTreeMap<OperatorHpkePubkey, Ciphertext>, // BTreeMap = sorted iteration
})
2. BTreeMap gives free canonical ordering. Operators and challengers use the exact same serializer from a shared crates/core/hpke_envelope
module — no custom impls. This also serves Q1: the witness sig covers these bytes exactly, so a gateway adding/removing a recipient breaks the
sig.
3. Upload request carries both the leaf and the intended operator set snapshot. Payload:
upload = {
leaf_key, leaf_value_hpke, intended_operator_set_hash, sequence_no_hint
the pros/cons question.\n \n When the interview resumes, the user expects an analysis of why three prefixed key spaces exist (identity /
confidential / secrets) — distinct from the already-decided "one tree vs three trees" question. This is the conceptual subtree separation
within the unified tree. The user is stress-testing §R.5 from a new angle.\n \n Pros candidates: different authorization models per kind
(user-self for identity, provider+policy-client two-step for confidential, policy-client-owner-implicit for secrets); different data
custodians; different access patterns (hot-path WASM for secrets, Rego eval for identity/confidential); different rotation cadences;
different potential compliance regimes.\n \n Cons candidates: one tree already unifies them so "subtree" is just key-prefix convention;
authorization rules are per-leaf-kind anyway regardless of tree structure; operators have to demultiplex by key prefix at read time.\n\n9.
Optional Next Step:\n \n Answer the user's most recent explicit question verbatim:\n \n > "one quick question back to Q2: then what
is the rationale pros vs cons for having separate subtrees for each private data type?"\n \n Specifically, produce a pros/cons table for
keeping three conceptual subtrees (identity/confidential/secrets) as distinct key-prefix namespaces within the now-unified JMT (Option C
locked). The question is NOT "three trees vs one tree" (already decided: one tree); it's "three prefix-spaces vs one flat namespace" within
that one tree.\n \n Key analysis axes: authorization models per kind (user-self / provider+policy-client / policy-client-owner), data
custodianship, access patterns, rotation cadences, grouping for operator-internal iteration, challenger replay structuring, observability
separation, migration future-work (e.g., if Phase 2 wants different encryption schemes per kind, prefix separation preserves that option).\n
\n My recommendation will likely be: keep the three prefix-spaces (cost = zero, benefit = clean per-kind authorization and future
optionality), which is what the user has already implicitly been assuming throughout C lock-in. The question seems to be a final sanity
check on that assumption before returning to Q3 (HPKE seal authorship).\n \n After answering, return to Q3's three stacked sub-questions
(seal=client, bundle format, rotation policy).\n"}
PostCompact [bash "${CLAUDE_PLUGIN_ROOT}/hooks/python-launcher.sh" "${CLAUDE_PLUGIN_ROOT}/hooks/run.py"
skills/token-optimizer/scripts/measure.py quality-cache --force --quiet] completed successfully: You already have a custom status line
configured.
To integrate quality scoring, add this to your status line script:
// Read context quality score
const qFile = path.join(os.homedir(), '.claude', 'token-optimizer', 'quality-cache.json');
let qScore = '';
if (fs.existsSync(qFile)) {
try {
const q = JSON.parse(fs.readFileSync(qFile, 'utf8'));
const s = q.score;
if (s < 50) qScore = ' | \x1b[31mContextQ:' + s + '\x1b[0m';
else if (s < 70) qScore = ' | \x1b[33mContextQ:' + s + '\x1b[0m';
else qScore = ' | \x1b[2mContextQ:' + s + '\x1b[0m';
} catch (e) {}
}
// Append qScore to your output
⎿  Read docs/CLAUDE.md (7 lines)
⎿  Referenced file docs/PRIVATE_DATA_STORAGE.md
⎿  Read .claude/rules/error-selectors.md (24 lines)
⎿  Read .claude/rules/incidents-inbox.md (24 lines)
⎿  Read .claude/rules/agent-guide.md (137 lines)
⎿  Skills restored (superpowers:brainstorming, save-progress, commit-git, grill-me, pr, docs-sync, superpowers:writing-plans)
❯ one quick question back to Q2: then what is the rationale pros vs cons for having separate subtrees for each private data type?. Also for your
Q3, does PSS solves this issue?
⏺ Two good questions stacked. Answering both, then returning to Q3.
Part 1: Why keep three prefix-namespaces inside the unified JMT?
Clarifying the frame: under Option C (locked), there is one tree, one root, one commit, one quorum — forever. "Subtree" here is no longer a
structural term. It's a key-prefix convention: sha256("identity"||...) vs sha256("confidential/data"||...) vs sha256("secrets"||...). The tree
underneath is flat — all leaves share one root.
So the real question is: flat keyspace, or three prefix-namespaces within the flat keyspace?
Pros of keeping three prefix-namespaces (recommendation: keep them)
Axis: Per-kind authorization differs
Why it matters: identity = user self-sovereign (user ECDSA); identity/link = dual-auth (user + policy-client per-domain); confidential/data =
provider ECDSA; confidential/grant = two-step propose+accept; secrets = policy-client-owner-implicit. Operator apply-logic already branches
on
write_kind. Key-prefix makes the branch natural and makes mismatches (prefix ≠ witness.write_kind) a hard reject at the verification
boundary
— defense-in-depth against a class of witness-spoofing bugs.
────────────────────────────────────────
Axis: Access pattern separation
Why it matters: secrets/* is hot-path inside WASM sandbox via secrets::get(). identity/* and confidential/* are Rego-extension reads.
Prefix-range scans in redb (ordered KV) let operator code iterate by kind without filter-in-code. Also cleaner for challenger replay —
challenger can stream one prefix at a time.
────────────────────────────────────────
Axis: Rotation cadence differs
Why it matters: Secrets rotate daily (API keys), identity rotates weekly/monthly (KYC), confidential rotates per provider cadence. Prefix
separation preserves the option to apply per-kind rotation policies in Phase 2+ without re-keying the tree.
────────────────────────────────────────
Axis: Phase 2/3 optionality
Why it matters: If Phase 2 decides to migrate secrets to threshold encryption (MPK) while keeping identity per-operator HPKE, prefix separation
is the natural seam. Flat keyspace would require a tree-wide re-key migration.
────────────────────────────────────────
Axis: Compliance surface differs
Why it matters: identity is PII (GDPR); confidential is business secret; secrets is credential-class (PCI-adjacent). Prefix preserves per-kind
retention, export-control, jurisdictional partitioning options.
────────────────────────────────────────
Axis: Observability
Why it matters: state_tree_writes_total{kind="identity|confidential|secrets"} — cardinality bounded, dashboards naturally split.
Cons
┌──────────────────────────────────────────────────────────────────────────┬───────────────────────────────────────────────────────────────┐
│ Concern │ Severity │
├──────────────────────────────────────────────────────────────────────────┼───────────────────────────────────────────────────────────────┤
│ Terminology trap — calling these "subtrees" when they're not structural │ Doc-only. Fix by renaming to "key-prefix namespaces" in §4, │
│ Merkle subtrees will mislead reviewers. │ §5, §R.5. │
├──────────────────────────────────────────────────────────────────────────┼───────────────────────────────────────────────────────────────┤
│ Risk of prefix/write_kind drift — if operator parses prefix from raw key │ Solved by making witness carry explicit write_kind and │
│ material to route auth rules, a malformed prefix could misroute. │ rejecting on prefix≠witness.write_kind mismatch. │
├──────────────────────────────────────────────────────────────────────────┼───────────────────────────────────────────────────────────────┤
│ Cost │ Effectively zero. A few extra bytes of prefix string hashed │
│ │ into sha256. │
└──────────────────────────────────────────────────────────────────────────┴───────────────────────────────────────────────────────────────┘
Recommendation: keep the three prefix-namespaces. Rename "subtree" → "key-prefix namespace" everywhere in the spec so nobody thinks they're
independent Merkle trees. The separation is load-bearing for per-kind authorization and Phase 2 optionality, and the cost is zero.
★ Insight ─────────────────────────────────────
The pattern here is domain-separation-via-prefix-hashing — same technique used in BLS signing (keccak256("BLSSignatureChecker.hashMessage" ||
msg)) and EIP-712 (domain separator). Prefixes cost ~16 bytes of hash input but give you clean namespacing and per-domain rule enforcement
without structural change to the underlying primitive. Newton already uses this for data.identity.* / data.confidential.* / data.privacy.*
inside Rego — the state tree naming mirrors it, which keeps the whole-system mental model consistent.
─────────────────────────────────────────────────
Part 2: Does PSS solve Q3?
Short answer: PSS solves part of Q3.3 (rotation), but only for a hypothetical Phase 2+ threshold-storage variant. It does NOT help Q3.1 (seal
authorship) or Q3.2 (bundle format), and it does NOT apply to Phase 1 MVP as specced.
Let me decompose by sub-question:
Q3.1 — Seal authorship (seal = client, operators MUST NOT re-encrypt)
PSS does not help. This is about who computes HPKE SEAL, not what key it's sealed to. Even with PSS refreshing shares, the SEAL operation
itself is non-deterministic (ChaCha20Poly1305 uses a fresh random nonce per call). If two operators both seal, they get different ciphertexts →
different leaf values → different JMT roots → BLS quorum fails or splits. PSS leaves this bit-for-bit non-determinism intact.
Lock it: seal = client, always.
Q3.2 — Canonical bundle format
PSS does not help. The recipient set binding (recipient_set_hash = keccak256(sorted_operator_pubkeys)) is about who the ciphertext is readable
by, which in Phase 1's per-operator HPKE model means "which operator HPKE pubkeys were used at seal time". PSS refreshes shares of a threshold
key; it doesn't change anything about per-operator HPKE envelopes. Orthogonal.
Lock it: canonical bincode of BTreeMap<OperatorHpkePubkey, Ciphertext> with recipient_set_hash pinned in the auth_witness.
Q3.3 — Rotation policy (freeze-and-accept-staleness vs proxy re-encryption)
This is where PSS gets interesting — but with caveats.
PSS semantics recap:
- Classic PSS (Herzberg '95): refreshes individual shares of an existing secret. MSK unchanged, MPK unchanged, but individual shares rotated.
Defeats a mobile adversary who needs to compromise t shares in the same epoch.
- Dynamic PSS / Resharing: additionally lets the shareholder set change (operators join/leave). Still MSK/MPK unchanged. Ciphertexts sealed to
the MPK remain decryptable under the new set.
PSS would solve rotation IF two conditions hold:
1. Storage migrated from per-operator HPKE to threshold encryption (single MPK, n-of-n or t-of-n shares).
2. We run dynamic PSS (resharing, not just classic PSS) to handle operator set changes, not just refresh.
Under those conditions: client seals once to the MPK, MPK is stable across operator set changes via resharing, old ciphertexts stay decryptable
forever without client re-upload. Freeze-and-accept-staleness becomes obsolete for threshold-encrypted data.
Why PSS does not apply to Phase 1 MVP:
- §5.3 of the spec mandates per-operator individual HPKE keys: "encrypted to each operator's individual HPKE key". Each operator has their own
independent HPKE keypair — not shares of a common key.
- PSS is fundamentally about refreshing shares of a shared secret. You can't PSS-refresh independent keys because they're not derived from a
common secret.
- To get PSS benefits, Phase 1 would need to switch storage to threshold encryption from Day 1. That pulls FROST DKG + Lagrange-interpolation
decryption forward into Phase 1 MVP scope. Given the existing Phase 2 DKG roadmap (NEWT-176/177/178/638 done; 2C/2D open), this is a meaningful
scope expansion.
However, PSS is already on the Phase 2 roadmap for ephemeral privacy data (threshold-decrypted payloads today). The natural migration path:
┌─────────────┬───────────────────────────────────────┬───────────────────┬───────────────────────────────────────┐
│ Phase │ Data │ Encryption │ Rotation strategy │
├─────────────┼───────────────────────────────────────┼───────────────────┼───────────────────────────────────────┤
│ 1 MVP (now) │ All private data │ Per-operator HPKE │ Freeze-and-accept-staleness │
├─────────────┼───────────────────────────────────────┼───────────────────┼───────────────────────────────────────┤
│ 2 │ Ephemeral privacy (already threshold) │ Threshold MPK │ DKG + PSS refresh │
├─────────────┼───────────────────────────────────────┼───────────────────┼───────────────────────────────────────┤
│ 2.5 / 3 │ Stored secrets (migration) │ Threshold MPK │ PSS refresh + resharing on set change │
├─────────────┼───────────────────────────────────────┼───────────────────┼───────────────────────────────────────┤
│ 3 │ All private data │ Threshold MPK │ Dynamic PSS solves rotation natively │
└─────────────┴───────────────────────────────────────┴───────────────────┴───────────────────────────────────────┘
So the architectural implication for Phase 1:
The freeze-and-accept-staleness policy is correct for Phase 1 MVP because per-operator HPKE doesn't benefit from PSS. But the spec should flag
the seam: when Phase 2+ migrates storage to threshold, PSS/resharing becomes the rotation strategy and freeze-and-accept-staleness is retired.
This is a future-work seam worth documenting in §F so implementers don't hard-code freeze-semantics into paths that would need to flex later.
Also: Proxy re-encryption ≠ PSS
Quick disambiguation — the two options I posed in Q3.3 were freeze-and-accept-staleness vs proxy re-encryption (PRE). PRE is a different
primitive:
┌─────────────────────────────┬────────────────────────────────────────────────────────────────────┬───────────────────────────────────────┐
│ Primitive │ What it does │ Phase 1 cost │
├─────────────────────────────┼────────────────────────────────────────────────────────────────────┼───────────────────────────────────────┤
│ │ Operator holds a re-encryption key that transforms Enc(pk_old, m) │ Heavy — requires pairing-based or │
│ Proxy re-encryption (PRE) │ → Enc(pk_new, m) without decrypting. Enables ciphertext │ lattice-based PRE scheme, new key │
│ │ "migration" when operator set changes. │ infrastructure │
├─────────────────────────────┼────────────────────────────────────────────────────────────────────┼───────────────────────────────────────┤
│ │ Refreshes shares of a threshold key. MPK stable across refreshes. │ Phase 2 already on roadmap for │
│ PSS / dynamic PSS │ Only applies to threshold-encrypted data. │ ephemeral; extension to storage needs │
│ │ │ design work │
├─────────────────────────────┼────────────────────────────────────────────────────────────────────┼───────────────────────────────────────┤
│ Freeze-and-accept-staleness │ Old leaves readable only by seal-time operators. Rotation forces │ Zero — just accept that old data is │
│ │ clients to re-upload. │ inaccessible to new operators. │
└─────────────────────────────┴────────────────────────────────────────────────────────────────────┴───────────────────────────────────────┘
PSS is the elegant long-term answer if we migrate storage to threshold. PRE is almost never worth the complexity. Freeze-and-accept-staleness
is the right Phase 1 MVP choice.
★ Insight ─────────────────────────────────────
PSS and PRE are often conflated but solve different problems. PSS assumes you already have a threshold-shared secret and asks "how do we keep
the shares fresh without changing the secret?" PRE assumes you have independent keys and asks "how do we migrate ciphertext from key A to key B
without exposing plaintext?" Newton's architecture is built for threshold (DKG on the roadmap), so PSS is the natural long-term rotation
story. PRE would be a detour. For Phase 1's per-operator HPKE (no shared secret anywhere in the system), neither applies — which is why
freeze-and-accept-staleness is the honest choice.
─────────────────────────────────────────────────
Net decisions and returning to Q3
Q2 predecessor (prefix-namespaces): Keep three. Rename "subtree" → "key-prefix namespace" in spec. Zero cost, load-bearing for per-kind auth
and Phase 2 optionality. ✓ lock.
Q3.1 (seal authorship): PSS doesn't change the answer. Lock seal = client, operators MUST NOT re-encrypt in the spec. Confirm?
Q3.2 (bundle format): PSS doesn't change the answer. Lock canonical bincode BTreeMap<OperatorHpkePubkey, Ciphertext> + recipient_set_hash in
auth_witness. Confirm?
Q3.3 (rotation policy): Phase 1 = freeze-and-accept-staleness. PSS is the Phase 2+ migration target when/if storage moves to threshold
encryption. Spec §F should add a future-work seam: "PSS + dynamic resharing obsoletes freeze-and-accept-staleness once storage migrates to
threshold MPK (Phase 2+ scope)." Confirm?
One extra adversarial note surfaced by the PSS question: if we're going to land FROST DKG + threshold decrypt in Phase 2 anyway for ephemeral
privacy, should Phase 1's secrets/* namespace pre-plumb threshold as a stretch-goal rather than hard-wire per-operator HPKE? That would
collapse the Phase 1 → Phase 2 rotation migration into a single encryption scheme. It's not strictly in-scope for MVP, but it's worth a yes/no
on whether to flag it in §F.1 as a migration seam vs leave Phase 1 hard-on per-operator HPKE. Your call — but if it's "no, hard-wire
per-operator for Phase 1 MVP", that's a load-bearing commitment we should lock explicitly now rather than trip over in Phase 2.
✻ Cooked for 2m 27s
※ recap: Adversarial design review of Private Data Storage Sub-project A (Phase 1 MVP). Just answered two questions on prefix-namespaces and PSS;
waiting for confirmation on Q3's three locks (seal authorship, bundle format, rotation policy) before continuing the grill.
❯ per https://linear.app/magiclabs/project/newton-privacy-layer-e360cf0b6436/overview, didn't we already implement frost dkg _ threshold
decryption with dynamic PSS? Also, in non threshold decryption mode, when we say "per-operator hpke key", that key is the "SAME" key shared by
all operators
⏺ You're right to push back. Let me verify both claims before revising — I was pattern-matching off old mental model and that's exactly the kind
of stale-memory bug we warn about in agent-guide.md. Checking the actual code.
Searched for 2 patterns, read 1 file, listed 1 directory (ctrl+o to expand)
⏺ You're right on both counts. Verifying the HPKE-key-sharing claim in parallel before writing the full recalibration.
Searched for 1 pattern (ctrl+o to expand)
⏺ Bash(sed -n '1480,1610p' crates/gateway/src/handler/mod.rs)
⎿   Ok(GatewayResponse {
jsonrpc: "2.0".to_string(),
result: Some(result),
… +45 lines (ctrl+o to expand)
Searched for 2 patterns (ctrl+o to expand)
⏺ You're right on both counts. I was working off a stale mental model (memory file phase2-threshold-dkg.md dated 2026-03-29 says "2C Epoch
Rotation: Not started" — but the code shows it landed since). Let me stake out what's actually true from the code, then fully recalibrate.
Verification: both claims correct
PSS + dynamic resharing is implemented
┌────────────────────────────────────┬─────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ Evidence │ Location │
├────────────────────────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ PSS refresh primitives (share │ │
│ refresh, polynomial commitment │ crates/core/src/dkg/refresh.rs (430 lines, verify_refresh_share, exports from dkg/mod.rs:60) │
│ verification) │ │
├────────────────────────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Dynamic resharing (set changes, │ refresh.rs:313 test: "MPK must be unchanged after resharing to larger set"; refresh.rs:405 test: │
│ not just refresh) │ "MPK must be unchanged after resharing to smaller set" — 2-of-3 → 2-of-2 and its inverse both │
│ │ covered │
├────────────────────────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Gateway-side ceremony coordinator │ crates/gateway/src/dkg/refresh_coordinator.rs — "Gateway-side PSS refresh ceremony coordinator... │
│ │ Drives a 2-phase protocol (Collect + Apply) for proactive secret sharing refresh or resharing" │
├────────────────────────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Automatic rotation on a timer │ crates/gateway/src/dkg/epoch_manager.rs — "Background task that drives automatic PSS epoch rotation │
│ │ on a timer" │
├────────────────────────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Epoch lifecycle modeled │ dkg/types.rs:254 — "is created on each PSS refresh or resharing event" │
└────────────────────────────────────┴─────────────────────────────────────────────────────────────────────────────────────────────────────┘
So PSS refresh (classic Herzberg semantics, MSK unchanged, shares rotated) AND resharing (operator set changes, MPK unchanged, old ciphertexts
still decryptable) are both implemented and wired. The memory file I was pattern-matching against is out of date.
HPKE "per-operator key" is a SHARED key across operators in non-threshold mode
From crates/gateway/src/handler/mod.rs:1519 get_privacy_public_key:
// Non-threshold: query an operator for its HPKE public key.
match cs.operator_pool.broadcast_first_success(&rpc_request).await {
Ok((_operator_id, rpc_response)) => {
...
Ok(Self::build_privacy_public_key_response(&resp.public_key))
}
}
The broadcast_first_success pattern is the tell: the gateway pings operators, takes whichever responds first, returns that as THE privacy
pubkey to the client. For this to be coherent (any operator can later decrypt anything the client sealed), all operators must be holding the
same HPKE keypair — loaded from shared config/secret at deploy time. Otherwise the first-success-operator's response would be a key only that
operator can decrypt, which would break every envelope.
So in non-threshold mode: one shared X25519 HPKE keypair across all operators, distributed out-of-band at deploy time.
The docstring on get_secrets_public_key at line 1576 reinforces this — it says "individual operator's HPKE key" but contrasts against
"threshold MPK", so "individual" means "not threshold-protected", not "per-operator-unique".
★ Insight ─────────────────────────────────────
The broadcast_first_success pattern is a compact proof of key-sharing: a protocol designed for per-operator-unique keys would have to enumerate
every operator and return N keys so the client could seal to each one. Returning one key via first-success only makes cryptographic sense if
every operator holds the same key — a deployment choice, not a code-enforced invariant. This is the same pattern used in Fairblock and older
threshold-like setups before full DKG lands: a shared "bootstrap" key held by all operators to unblock non-threshold flows.
─────────────────────────────────────────────────
Full recalibration of Q3
Under corrected understanding, three encryption destinations exist in the deployed system:
┌───────────────────────────┬────────────────────────────────┬─────────────────────────────────────────────┬──────────────────────────────┐
│ Destination │ Cardinality │ Rotation mechanism │ Availability │
├───────────────────────────┼────────────────────────────────┼─────────────────────────────────────────────┼──────────────────────────────┤
│ Shared HPKE keypair │ 1 keypair, replicated across │ Operators all swap config together (manual │ Always — serves as pre-DKG │
│ │ all operators │ coordinated rotation) │ fallback │
├───────────────────────────┼────────────────────────────────┼─────────────────────────────────────────────┼──────────────────────────────┤
│ Threshold MPK │ 1 master key, t-of-n shares │ PSS refresh (Herzberg); dynamic resharing │ After DKG ceremony completes │
│ │ distributed │ on operator set change │ │
├───────────────────────────┼────────────────────────────────┼─────────────────────────────────────────────┼──────────────────────────────┤
│ Per-operator │ N keypairs (one per operator) │ N/A in deployed system │ Not used in non-threshold │
│ operator-bound keys │ │ │ privacy path │
└───────────────────────────┴────────────────────────────────┴─────────────────────────────────────────────┴──────────────────────────────┘
Q3.3 rotation — completely different answer
My prior freeze-and-accept-staleness recommendation was built on a misread: I thought each operator had an independent key, so rotation =
re-upload. With shared-HPKE-key and already-implemented PSS, the real picture:
Identity and confidential data: Seal to threshold MPK when DKG is active, shared HPKE as pre-DKG fallback. Once DKG active:
- PSS refresh handles mobile-adversary concerns without changing MPK → ciphertexts stay decryptable.
- Dynamic resharing handles operator join/leave without changing MPK → ciphertexts stay decryptable.
- No freeze-and-accept-staleness. No re-upload. PSS + resharing are the rotation story natively.
Secrets: Forced to shared HPKE because Prepare-phase decryption doesn't have threshold machinery available (per get_secrets_public_key
docstring). Rotation options here are narrower:
- (a) Coordinated key rotation across all operators + re-encrypt all stored secrets (gateway can't decrypt → clients must re-upload; same cost
as freeze).
- (b) Accept staleness window between rotation and client re-upload (freeze semantics).
- (c) Future Phase 2+: migrate secrets to threshold once Prepare-phase threshold decrypt becomes feasible.
Q3.3 corrected recommendation
- Identity/confidential: MPK-sealed. Gate Phase 1 MVP storage writes on "DKG complete" invariant so pre-DKG shared-HPKE sealing never happens —
eliminates the rotation seam entirely for these two kinds. PSS + resharing handle all rotation natively. Spec §F documents secrets as the only
remaining rotation subproblem.
- Secrets: Shared HPKE is the forced path. Accept Phase 1 MVP freeze-or-re-upload-on-rotation for this one namespace. Tag in §F as
"post-Phase-1 goal: migrate secrets to Prepare-compatible threshold scheme (requires Prepare-phase threshold decrypt, currently not feasible)."
Q3.1 and Q3.2 unchanged
Still correct:
- Seal = client, always. Operators never re-encrypt (non-deterministic SEAL breaks bit-equality regardless of which encryption destination).
- Canonical bundle format with recipient_set_hash pinned in auth_witness still matters — it identifies which MPK version (pre/post-resharing)
or which shared-HPKE-key version the envelope was sealed to, so operators can reject envelopes sealed to a key they no longer hold.
Actually let me refine Q3.2 under the corrected model: since there's only ONE recipient key at any time (either the single shared HPKE pk or
the single threshold MPK), the bundle is NOT a BTreeMap<OperatorHpkePubkey, Ciphertext> — it's just a single ciphertext plus a metadata tag
pinning which key version. Much simpler:
struct PrivacyEnvelope {
version: u16,
scheme: EncryptionScheme, // SharedHpke | ThresholdMpk
recipient_key_hash: [u8; 32], // keccak256(pk bytes) — pins which key version
ciphertext: Vec<u8>, // HPKE encapsulated key || AEAD(ct)
}
The auth_witness signs over keccak256(write_kind || leaf_key || envelope_bytes || nonce || chain_id). Operators at apply-time compute
keccak256(their_current_recipient_key_bytes) and reject if it doesn't match recipient_key_hash. Under resharing, MPK is unchanged so hash is
unchanged — no reject. Under shared-HPKE rotation, the hash changes — writes sealed to the old key get rejected, forcing re-upload (the freeze
case for secrets only).
New locked decisions
Q3.1 (seal authorship): Locked. Seal = client, operators MUST NOT re-encrypt.
Q3.2 (envelope format, corrected): Single-ciphertext envelope with recipient_key_hash pinning which key version. Apply-time rejection on hash
mismatch.
Q3.3 (rotation, corrected): Two different rotation stories per namespace:
- identity/*, confidential/*: MPK-sealed + require DKG-complete before writes → PSS + resharing solve rotation natively. No freeze semantics
needed.
- secrets/*: Shared-HPKE-sealed (forced by Prepare-phase decrypt constraint) → freeze-or-re-upload on rotation. Spec §F tags as future
migration target.
Implications for the spec
Changes I'd make to docs/PRIVATE_DATA_STORAGE.md under Option C + corrected Q3:
┌──────────────────────────┬───────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ Section │ Change │
├──────────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ │ Add explicit statement: "Phase 1 MVP storage requires DKG ceremony completed before any write. Identity and │
│ §2 Trust Model │ confidential data MUST be sealed to threshold MPK. Secrets MUST be sealed to the shared HPKE public key │
│ │ (Prepare-phase decrypt constraint)." │
├──────────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §5.1, §5.2 (identity, │ Change from hpke_value to threshold_envelope pinning recipient_key_hash == keccak256(current_MPK). │
│ confidential leaf value) │ │
├──────────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §5.3 (secrets leaf │ Change from "encrypted to each operator's individual HPKE key" (wrong) to "encrypted to the shared operator │
│ value) │ HPKE public key" with recipient_key_hash pinning. │
├──────────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ │ "Key rotation: PSS refresh of MPK does NOT affect state tree semantics — MPK is stable. Dynamic resharing on │
│ §6.5 or new §6.6 │ operator set change likewise preserves MPK. Only shared-HPKE-key rotation (affects secrets) triggers envelope │
│ │ rejection at apply time." │
├──────────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §9 Write path │ Add invariant check before delta blob accept: recipient_key_hash field in each envelope must match operator's │
│ │ current recipient key for the namespace (MPK for identity/confidential, shared HPKE pk for secrets). │
├──────────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §F Future Work │ Secrets-to-threshold migration is the only remaining rotation seam. Flag as Phase 2+ once Prepare-phase │
│ │ threshold decrypt is feasible. │
├──────────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §Q Open Questions │ §Q.1 (single operator set vs partitioned) was resolved to "single" by Option C lock. Close this. │
└──────────────────────────┴───────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
Corrections I'd make to memory too
The phase2-threshold-dkg.md memory file is stale — shows 2C as "Not started" but the code has refresh.rs, refresh_coordinator.rs,
epoch_manager.rs. Worth updating at some point so future sessions don't trip over it. Happy to do this now or end-of-interview.
Next
Q3 is effectively locked under the corrected model. Ready to move to the next adversarial branch — queue includes: delete semantics under
witnesses, snapshot trust in Phase 1 single-bootnode, detection-only slashing seam, EigenDA delta ordering validation. Which do you want to
fire next, or should I pull the one most at risk of corner-painting the in-flight implementation?
✻ Sautéed for 2m 49s
※ recap: Adversarial review of Private Data Storage spec (Sub-project A) via grill-me; just verified PSS+resharing is already implemented and
HPKE is a shared-key across operators, so Q3 rotation collapses to MPK+PSS for identity/confidential and freeze-or-re-upload for secrets. Next:
pick the next branch to fire (delete semantics, bootnode trust, detection-only slashing, or EigenDA ordering).
❯ for the shared hpke encryption key, let's say the key rotates. Is there a way to prevent users from re-uploading? What about re-encrypt?
⏺ Good question — this is the subtle part of the story. The honest answer is that every path to "no re-upload" either exposes plaintext to
operators (violating Newton's core invariant) or adds substantial cryptographic machinery. Let me walk through the full option space, then
recommend.
The tension
Under shared-HPKE, "rotating the key" means:
- Old key (sk_old, pk_old) is retired and no operator should hold sk_old after the rotation window closes
- New key (sk_new, pk_new) is distributed to all operators
- Old envelopes in the JMT are HPKE_seal(pk_old, secret) — they're only decryptable by holders of sk_old
To preserve old envelopes without re-upload, something has to transform Enc(pk_old, secret) → Enc(pk_new, secret). Three fundamental approaches
differ in who does the transformation and whether plaintext is ever exposed.
Option A — Operator decrypt-and-reencrypt
Each operator, while still holding sk_old, performs:
plaintext = HPKE_open(sk_old, old_envelope)
new_envelope = HPKE_seal(pk_new, plaintext)
Three fatal problems:
1. Plaintext exposure. Operator holds plaintext in memory during the loop. This violates §S of the privacy spec: "operators see plaintext only
during policy evaluation, and only inside the Rego/WASM sandbox." A bulk re-encryption pass would materialize every stored secret in every
operator's memory — catastrophic for compromise blast radius (memory dump, Spectre-class leak, compromised operator → every historic secret
leaks).
2. BLS quorum divergence. HPKE SEAL is non-deterministic (ChaCha20Poly1305 random nonce). Every operator produces a different new_envelope.
When committed to JMT, roots diverge → BLS quorum fails. This is the same equivocation bug we flagged for client-vs-operator seal.
3. Authorization gap. The original auth_witness was signed by the data owner (policy client for secrets). A re-encrypted write isn't authorized
by that signature — it's an operator-initiated state change with no client sign-off. Needs a whole new authorization model.
Verdict: disqualified. Violates the plaintext-stays-in-sandbox invariant.
Option B — Proxy re-encryption (PRE)
A cryptographic primitive where an operator holding a re-encryption key rk_{old→new} can transform Enc(pk_old, m) → Enc(pk_new, m) without ever
seeing m.
new_envelope = PRE_reencrypt(rk_{old→new}, old_envelope)
Well-studied schemes: AFGH (2005, pairing-based, unidirectional), BBS98 (DL-based, bidirectional), Umbral (NuCypher, production-hardened
threshold PRE).
Solves the plaintext problem. But:
┌──────────────┬───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ Issue │ Impact │
├──────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ New crypto │ PRE schemes are typically pairing-based (BLS12-381, BN254) or specialized DL groups. Newton's HPKE is X25519 + │
│ stack │ ChaCha20Poly1305 — not PRE-compatible at the byte level. Ciphertext format changes post-rotation. Operators need a │
│ │ PRE-decrypt path in addition to HPKE-decrypt path. │
├──────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ │ PRE is also randomized. Different operators applying the same rk to the same old ciphertext produce different new │
│ Determinism │ ciphertexts → same BLS quorum divergence. Workaround: designate one "prover operator" per rotation batch, others verify; │
│ │ adds liveness dependency. │
├──────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ │ rk_{old→new} must be generated by a holder of sk_old. In shared-HPKE model every operator holds sk_old, so any one can │
│ rk secrecy │ generate rk — but rk is then sensitive (reveals the old→new transition). Handled cleanly only by threshold PRE │
│ │ (Umbral-style) which splits rk into t-of-n shares. │
├──────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Backfill │ Linear in the number of stored envelopes. For N secrets, N pairing operations. Not hot-path, but rotation becomes a batch │
│ cost │ job measured in minutes/hours. │
├──────────────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Audit │ New crypto = new audit. Newton's security review would have to cover the PRE implementation; limited battle-tested Rust │
│ surface │ crates exist. │
└──────────────┴───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
Verdict: technically sound but heavy lift. Appropriate for Phase 2+ if rotation-without-re-upload becomes a hard requirement. Not a Phase 1 MVP
scope.
Option C — TEE-scoped re-encryption (Newton-native)
Leverage the Nitro Enclave infrastructure already in place for privacy tasks (see docs/ENCLAVE.md). The enclave becomes the isolation boundary
for the plaintext:
# Inside operator's Nitro Enclave (attested, memory-sealed):
plaintext = HPKE_open(sk_old, old_envelope) # plaintext never leaves enclave
new_envelope = HPKE_seal(pk_new, plaintext)
emit(new_envelope, plaintext_hash_commitment) # commitment for verification
The plaintext exposure problem from Option A dissolves because the enclave's memory is sealed and attested — the host operator process never
sees it.
Addressing the determinism problem:
- Option C.1: Designated prover. One operator's enclave does the re-encryption; other operators' enclaves verify by decrypting the new envelope
with sk_new and checking Hash(plaintext) == plaintext_hash_commitment from the prover. Quorum certifies agreement on the new envelope.
Requires a prover election protocol (round-robin, deterministic from rotation_epoch).
- Option C.2: Deterministic HPKE variant. Derive ephemeral key and AEAD nonce from Hash(old_envelope_bytes, pk_new, rotation_epoch, leaf_key) —
custom, non-standard. Every operator produces the same new_envelope bit-for-bit. But it's a custom AEAD mode; the security analysis is subtle
(plaintext-equality leaks across leaves unless leaf_key is in the derivation, which C.2 does have). Risky — needs crypto review.
┌─────────────────────────────────────────────────────────┬────────────────────────────────────────────────────────────────────────────────┐
│ Pros │ Cons │
├─────────────────────────────────────────────────────────┼────────────────────────────────────────────────────────────────────────────────┤
│ Leverages existing Nitro Enclave infrastructure │ Requires attestation coverage to extend to re-encryption code path (new PCR0 │
│ │ version) │
├─────────────────────────────────────────────────────────┼────────────────────────────────────────────────────────────────────────────────┤
│ No new crypto primitive (Option C.1 just uses HPKE │ Designated-prover adds liveness dependency; election protocol is new │
│ inside TEE) │ │
├─────────────────────────────────────────────────────────┼────────────────────────────────────────────────────────────────────────────────┤
│ Plaintext stays inside attested boundary │ Re-encryption throughput capped by enclave performance │
├─────────────────────────────────────────────────────────┼────────────────────────────────────────────────────────────────────────────────┤
│ Quorum-verifiable via Hash(plaintext) commitment │ Enclave compromise collapses the guarantee — but same is true for all Newton │
│ │ privacy today │
└─────────────────────────────────────────────────────────┴────────────────────────────────────────────────────────────────────────────────┘
Verdict: most Newton-native option. Realistic for Phase 1 MVP if we accept the designated-prover liveness pattern. Does not require new
cryptographic primitives; does require attestation-coverage extension and a prover-election scheme.
Option D — Eliminate the problem: migrate secrets to threshold
Put secrets behind threshold MPK, same as identity/confidential. PSS refresh + dynamic resharing then handle rotation natively (MPK stable
across refreshes → old ciphertexts stay decryptable forever).
The blocker is §1576 of the gateway code and docs/PRIVACY.md:
▎ "WASM secrets must be encrypted per-operator so operators can decrypt independently during the Prepare phase — threshold decryption isn't
▎ available until Commit."
But this is a design choice, not a hard constraint. Today's ephemeral privacy payloads already use threshold decryption via operators
pre-computing partial DH outputs (deterministic, no cooperation needed) and combining at decrypt time. The same pattern could work for secrets:
# Prepare phase, each operator independently:
partial_i = threshold_partial_dh(share_i, ciphertext_enc_key) # deterministic
# At secrets::get() call inside WASM:
dec_key = combine_partials([partial_i]_i) # Lagrange interp, same for all
plaintext = AEAD_decrypt(dec_key, ciphertext)
Operators collect their own partials up-front (no coordination), then each one combines independently at secrets::get() time using the partials
from the other operators that they retrieved alongside the envelope. Plaintext is reconstructed locally in WASM sandbox, never crosses the
operator boundary.
The constraint the docstring is really capturing: Commit-phase threshold decryption requires inter-operator coordination. Prepare-phase does
not, as long as partials are pre-computed.
┌────────────────────────────────────────────────────────┬─────────────────────────────────────────────────────────────────────────────────┐
│ Pros │ Cons │
├────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────────────────────────────┤
│ Rotation problem dissolves entirely — PSS + resharing │ Migration cost: secrets becomes threshold-dependent; DKG must run before any │
│ already solve it │ secrets can be uploaded │
├────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────────────────────────────┤
│ Unifies encryption story across all three namespaces │ Requires refactoring secrets::get() plumbing + SecretsRegistry schema │
├────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────────────────────────────┤
│ Leverages machinery already built for ephemeral │ Latency: partial-fetch + combine adds ~few ms to Prepare phase per secret │
│ privacy │ access │
├────────────────────────────────────────────────────────┼─────────────────────────────────────────────────────────────────────────────────┤
│ Smaller surface area long-term (one scheme, not two) │ Adds a hard dependency: no secrets without DKG — can't use pre-DKG shared-HPKE │
│ │ fallback │
└────────────────────────────────────────────────────────┴─────────────────────────────────────────────────────────────────────────────────┘
Verdict: the right long-term answer. Eliminates the rotation problem by removing the primitive that has it. Scope of work is non-trivial but
bounded — all the threshold machinery exists. Not Phase 1 MVP scope, but a clean Phase 2 target.
Recommendation for Phase 1 MVP
Given shipping pressure and the scoping decision to keep Phase 1 MVP lean:
1. Phase 1 MVP: Accept re-upload on shared-HPKE rotation for secrets. Document in §F as a known limitation. Make rotation a rare admin event
(annually, not quarterly) and coordinate with clients via a deprecation window. Operationally this is similar to how TLS certificate rotation
is handled today — planned, infrequent, client-aware.
2. Phase 1 MVP guard: Include recipient_key_hash in every envelope + auth_witness. Apply-time rejection on mismatch. This makes "you're sealing
to an expired key" a loud client-side error, not a silent corruption.
3. Phase 2 target: Option D (migrate secrets to threshold). Folds secrets rotation into the PSS story that already exists for
identity/confidential. Eliminates the shared-HPKE rotation problem entirely.
4. Phase 2 fallback if D is blocked: Option C (TEE-scoped re-encryption, designated-prover variant). Uses existing Nitro Enclave infra, no new
crypto, preserves plaintext-stays-in-sandbox invariant.
5. Explicitly do not pursue: Option A (plaintext-exposing re-encrypt) — violates the core invariant. Option B (PRE) — too heavy for the value;
D or C are both cheaper.
★ Insight ─────────────────────────────────────
The deeper architectural lesson here: rotation cost is determined by the encryption scheme's key-identity binding, not the rotation mechanism
itself. Per-key schemes (shared HPKE) bind ciphertext to the exact key used at seal — rotation necessarily invalidates or migrates ciphertext.
Threshold schemes bind ciphertext to the MPK, which is invariant under share refresh/resharing — rotation is free. Once you have threshold
crypto in the stack (as Newton does), the "cheapest rotation" answer is always "use threshold, not per-key." The PRE path and TEE path are both
workarounds for a system that doesn't want to invest the refactor cost to move the last primitive into threshold.
─────────────────────────────────────────────────
Spec implications if we lock recommendation 1 + 3
┌────────────┬─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ Section │ Change │
├────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §S │ Explicit statement: "Secrets leaves are HPKE-sealed to a shared operator key. On rotation of this key, clients must │
│ Security │ re-upload affected secrets within the grace window. Rotation is an admin-coordinated event scheduled rarely (default: │
│ │ annual); rotation metadata is emitted on-chain so clients can detect and react." │
├────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §F Future │ Add §F.X: "Phase 2 target: migrate secrets/* namespace to threshold-MPK encryption with Prepare-phase partial-DH │
│ Work │ pre-computation. Folds secrets rotation into PSS + dynamic resharing, eliminating shared-HPKE rotation cost." │
├────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §9 Write │ Add invariant: auth_witness.recipient_key_hash must match the operator's current recipient key for the target namespace. │
│ path │ Apply-time reject with typed error (RecipientKeyMismatch { expected, got }) so clients can distinguish from other rejection │
│ │ reasons. │
├────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §R │ Add §R.X: "Why shared HPKE, not per-operator unique: broadcast_first_success pattern in newt_getPrivacyPublicKey requires │
│ Rationale │ all operators return the same key. Per-operator-unique keys would require enumerating all N operator keys to clients at │
│ │ seal time, and operator set changes would invalidate in-flight envelopes." │
└────────────┴─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
Next adversarial branch
This resolves the Q3 rotation thread cleanly under Option C lock. Ready to move to the next branch. Queue (in rough order of "costly to unwind
if wrong"):
1. Delete semantics under per-write witnesses — who can authorize deletion; append-only JMT vs tombstone markers; interaction with signed-RPC
read proofs.
2. Phase 1 MVP detection-only slashing seam — what punitive mechanism does D12/D13/E5 produce, and how does it transition to NEWT-810's
on-chain JMT proof-and-slash without schema churn.
3. Snapshot trust in Phase 1 single-bootnode — a single-point-of-failure-and-corruption; what's the integrity check at bootstrap time and
what's the recovery if the bootnode lies.
4. EigenDA delta ordering validation — what guarantees monotonic sequenceNo, how are operators convinced they've applied every delta, what
happens on out-of-order arrival.
Want me to pick (1) or (3)? Those are the two I'd prioritize — (1) has the largest invariant-boundary surface and (3) has the tightest
data-loss window.
✻ Sautéed for 2m 48s
❯ key rotation for shared hpke key is a requirement in mvp phase 1, and I don't think we would be able to have policy client secrets to be
threshold decrypted by Prepare phase unless we make it 3 phases not 2 phases. This would hurt the latency of the task too much, yet the
reupload requirement due to key rotation is also not an acceptable UX. How should we tackle this problem?
⏺ This is a genuine constraint triangle, and the answer I'd been drifting toward was wrong. Let me challenge the premise that
threshold-decrypt-in-Prepare forces a 3-phase protocol — because I think that assumption is load-bearing and doesn't actually hold if you move
partial computation from task-time to write-time. If the premise breaks, the triangle dissolves.
Why you'd think threshold decrypt adds a phase
The mental model that forces 3-phase: each operator's partial is task-bound — computed at task execution time, scoped to this specific Prepare.
To get t partials together, you need either (a) an extra roundtrip mid-task (3-phase) or (b) gateway-mediated collection (which is effectively
3-phase with different packaging).
That's how Newton's existing ephemeral privacy works today. From docs/PRIVACY.md:444:
▎ "In threshold mode, also forwards partial DH outputs via threshold_partial_decryptions + threshold_public_shares + threshold_config"
The gateway collects partials across operators in Prepare, forwards the bundle in Commit, operators combine locally at Commit. That's the
2.5-phase shuffle — it works for data decrypted AT Commit, but it doesn't work for secrets that need to be decrypted DURING Prepare inside WASM
secrets::get().
The actual structure of a threshold partial
For the HPKE-threshold scheme Newton uses (ECDH-based): ciphertext (enc, ct) where enc = g^r is the sender's ephemeral public key. Each
operator holds share s_i of the master secret key sk. The partial is:
partial_i = enc^{s_i}
Critical observation: partial_i depends only on enc (a property of the ciphertext) and s_i (a property of the operator). It does NOT depend on
any task-specific nonce, any requester, any evaluation context. Once computed for a given ciphertext, it is forever valid for that ciphertext.
This is the cryptographic property that dissolves the 3-phase forcing. Partials are ciphertext-bound, not task-bound. They can be pre-computed
and stored.
★ Insight ─────────────────────────────────────
Newton's ephemeral privacy uses task-bound partials because ephemeral payloads are task-unique — there's no reason to pre-compute partials for
a ciphertext that will never repeat. Secrets are the opposite: stored once, read thousands of times. Pre-computing partials amortizes the EC
mul across every future read, and — not coincidentally — solves the key-rotation problem for free. The asymmetry between "data used once" and
"data stored forever" often maps to "compute at use-time" vs "compute at store-time" in crypto protocols.
─────────────────────────────────────────────────
The proposal: partials-at-rest in the JMT
Write path
1. Client seals secret to threshold MPK: envelope = HPKE_threshold_seal(MPK, plaintext) → produces (enc, ct) pair
2. Client uploads envelope via newt_storeEncryptedSecrets with auth_witness
3. Gateway includes the write in the next delta blob (as today)
4. Operators see the write, each computes their partial: partial_i = enc^{s_i} (one EC mul per operator per secret)
5. At the next 120s BLS state commit window, each operator includes (partial_i, operator_id) in their signed state commit
6. The committed JMT state now has, at sha256("secrets" || secret_id):
leaf_value = {
envelope: (enc, ct),
partials: [(operator_id_1, partial_1), ..., (operator_id_n, partial_n)],
mpk_epoch: u64, // which MPK this is sealed to
recipient_key_hash: [u8; 32], // keccak256(MPK at seal time)
}
Read path (inside WASM Prepare-phase secrets::get())
1. Operator reads leaf locally from its redb-backed JMT (no network)
2. Operator combines t partials via Lagrange interpolation: shared_secret = prod(partial_i ^ lagrange_coef_i) (one EC mul + one EC addition per
partial; ~0.5ms for t=5 on X25519)
3. Operator derives AEAD key via HPKE KDF from shared_secret
4. Operator AEAD-decrypts ct to plaintext
5. WASM secrets::get() returns plaintext synchronously
Zero extra roundtrips at task time. Zero extra phases. All heavy work happens at write time, amortized across every future read.
Costs
┌─────────────────────┬────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ Dimension │ Overhead │
├─────────────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Write latency │ Unchanged — still bounded by 120s state commit cadence (partials fold into existing commit) │
├─────────────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Read latency │ +0.5-1ms per secret access for Lagrange interpolation. Standard threshold-HPKE decrypt cost. │
│ (Prepare phase) │ │
├─────────────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Storage per secret │ +~32 bytes × n operators. For n=10 and 1,000 secrets: ~320KB. Trivial against EigenDA / redb. │
├─────────────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Partial computation │ One EC mul per operator per secret. Sub-millisecond. Folded into existing state commit work. │
│ at write │ │
├─────────────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ New crypto code │ Zero — threshold HPKE, Lagrange interpolation, and PSS/resharing primitives all exist in crates/core/src/dkg/ │
│ │ already. This is a storage-layout change + a secrets::get() refactor, not new cryptography. │
└─────────────────────┴────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
Rotation, for real this time
┌──────────────────────────┬───────────────────────────────────────────────────────────────────┬──────────────────────────────────────────┐
│ Event │ What happens to stored partials │ Client re-upload? │
├──────────────────────────┼───────────────────────────────────────────────────────────────────┼──────────────────────────────────────────┤
│ │ Shares change (s_i → s'_i) but MPK unchanged. Stored partials │ │
│ PSS share refresh │ (computed under old shares) combine to the same sk · enc = MPK^r │ No │
│ │ as new partials would. Old partials remain valid forever. │ │
├──────────────────────────┼───────────────────────────────────────────────────────────────────┼──────────────────────────────────────────┤
│ Dynamic resharing (set │ MPK unchanged. Stored partials from A,B,C still present in JMT. │ │
│ change {A,B,C} → │ Operator D can read them directly or optionally compute its own │ No │
│ {B,C,D}) │ partial for redundancy. │ │
├──────────────────────────┼───────────────────────────────────────────────────────────────────┼──────────────────────────────────────────┤
│ Dynamic resharing (full │ MPK unchanged. Stored partials from A,B,C are data-at-rest — │ │
│ turnover {A,B,C} → │ readable by anyone holding JMT state. D,E,F use them directly. │ No │
│ {D,E,F}) │ │ │
├──────────────────────────┼───────────────────────────────────────────────────────────────────┼──────────────────────────────────────────┤
│ Full DKG re-run (MPK │ │ Yes — but this is an emergency event │
│ changes — emergency │ Stored partials invalid. Re-upload required for affected secrets. │ (EpochRegistry emergency rotation │
│ rotation only) │ │ signal), not routine rotation │
├──────────────────────────┼───────────────────────────────────────────────────────────────────┼──────────────────────────────────────────┤
│ Operator HPKE shared-key │ Not applicable — this scheme doesn't use a shared HPKE key. The │ │
│ rotation (the original │ rotation primitive disappears. │ N/A │
│ problem) │ │ │
└──────────────────────────┴───────────────────────────────────────────────────────────────────┴──────────────────────────────────────────┘
The shared-HPKE-rotation problem for secrets ceases to exist under this design, because secrets are no longer sealed to the shared HPKE key.
Why this is actually simpler than the alternatives
┌───────────────────────────────┬───────────────────────────────────────────┬──────────────────────┬───────────────┬─────────────────────┐
│ Option │ Phase 1 MVP cost │ Rotation UX │ Plaintext │ New crypto │
│ │ │ │ exposure │ │
├───────────────────────────────┼───────────────────────────────────────────┼──────────────────────┼───────────────┼─────────────────────┤
│ Keep shared HPKE for secrets │ Zero │ Unacceptable (per │ None │ None │
│ + accept re-upload │ │ constraint) │ │ │
├───────────────────────────────┼───────────────────────────────────────────┼──────────────────────┼───────────────┼─────────────────────┤
│ TEE re-encrypt (Option C from │ Attestation coverage extension, │ Clean (in-enclave) │ None │ None │
│ prior) │ prover-election protocol, new PCR0 │ │ │ │
├───────────────────────────────┼───────────────────────────────────────────┼──────────────────────┼───────────────┼─────────────────────┤
│ PRE (Option B from prior) │ Large (new pairing crypto stack, library │ Clean │ None │ Yes — new primitive │
│ │ choice, audit) │ │ │ │
├───────────────────────────────┼───────────────────────────────────────────┼──────────────────────┼───────────────┼─────────────────────┤
│ 3-phase threshold (what you │ Task latency cost │ Clean │ None │ None (already have │
│ were avoiding) │ │ │ │ threshold) │
├───────────────────────────────┼───────────────────────────────────────────┼──────────────────────┼───────────────┼─────────────────────┤
│ Pre-stored partials in JMT │ Storage layout change + secrets::get() │ Clean (native PSS) │ None │ None (already have │
│ (this proposal) │ refactor │ │ │ threshold) │
└───────────────────────────────┴───────────────────────────────────────────┴──────────────────────┴───────────────┴─────────────────────┘
The pre-stored-partials design reuses every crypto primitive Newton already ships and adds zero phases to task execution. The entire cost is
engineering, not cryptography.
The catches
Three places where honest tradeoffs show up:
1. Write-time liveness. Partials must be committed at write time; if fewer than t operators contribute at the 120s boundary, the write is
incomplete and client must retry. Same liveness assumption as the existing BLS state commit protocol — no new weakness.
2. Bootstrap ordering. Phase 1 MVP invariant hardens: DKG must complete before any secret upload. There is no shared-HPKE fallback for secrets.
If DKG hasn't run, secrets endpoint returns an error. This is a stronger invariant than identity/confidential have (which could fall back to
shared HPKE) and needs explicit gating in newt_storeEncryptedSecrets.
3. Partial storage bloat over very long time horizons. After many dynamic-resharing events, stored partials accumulate (old + new sets).
Mitigation: garbage-collect partials from operator sets older than k resharing generations, keeping only current + previous two. Old secrets
that lose their partial quorum due to GC would need backfill (each current operator computes their partial for the secret). Batch migration
job, no plaintext exposure.
Concrete implementation in the plan
This changes the shape of Stream A and Stream B tasks in the implementation plan in two focused places:
Stream A — state-tree crate: the secrets namespace leaf value schema gets a partials: Vec<(OperatorId, Partial)> field alongside the
ciphertext. Partial type is EdwardsPoint (X25519 representation, 32 bytes). Leaf serialization (bincode) straightforward.
Stream A — secrets::get() path: operator-local combine-and-decrypt helper, called from WASM extension. Needs ThresholdContext (already plumbed
through operator for ephemeral privacy) + stored partials from JMT. ~100 LoC of logic plus a dependency wire-up.
Stream B — SecretsRegistry contract: unchanged at the contract level (it's a state-root committer, doesn't care about leaf internals).
Stream D — gateway: newt_getSecretsPublicKey now returns MPK (not shared HPKE pk). Gated on threshold_ctx.is_some() — if DKG hasn't run,
endpoint errors out with DkgNotReady.
Stream D — write path: operator, on seeing a secrets write in a delta blob, computes its partial inside the apply loop and queues the partial
for inclusion in the next state commit alongside its BLS signature share. Lightweight — partial computation is one EC mul.
New Stream (could fold into D): "partial backfill" job for dynamic resharing events. Triggered off SharesRefreshed(new_set, new_epoch) event
from the EpochRegistry. Iterates the secrets subtree, each new operator computes its partial for each secret, includes in subsequent state
commits. Throttled so it doesn't starve task-path latency.
Spec implications
┌────────────────┬─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ Section │ Change │
├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §5.3 Secrets │ Replace encrypted to each operator's individual HPKE key with: threshold-HPKE-sealed to MPK, with (partial_i, │
│ leaf value │ operator_id) tuples for each committed operator stored alongside the envelope. Partials are computed at write time by │
│ │ each operator and committed in the next BLS state commit window. │
├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §6 Commit │ Add: Partial commitment. Operators compute partial = enc^{s_i} for each new secrets-namespace write in the delta blob, │
│ Protocol │ include (partial_i, operator_id, partial_sig) in their state commit signature. A state commit is valid only if t │
│ │ partials are present for every new secrets write. │
├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §7 Contract │ No change — contracts don't see partials, only state root. │
│ Surface │ │
├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §8 EigenDA │ Add field: partial_contributions: Vec<(LeafKey, OperatorId, Partial)> alongside the existing writes. │
│ delta blob │ │
├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §9 Write path │ Add a client-visible caveat: secrets writes are fully available after the next state commit boundary (120s max), not │
│ │ immediately. (Same as all other writes — not a new constraint, just make it explicit for this namespace.) │
├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §F Future Work │ Remove the "secrets rotation migration to threshold" item — it's now in-scope for Phase 1 MVP, not future work. │
├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §Q Open │ Remove the shared-HPKE-rotation question — it's dissolved. │
│ Questions │ │
├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §2 Trust model │ Add: Phase 1 MVP requires DKG completion before secrets endpoints accept writes. No pre-DKG shared-HPKE fallback exists │
│ │ for secrets. │
├────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ §S Security │ Add: Partials are public information (one share of the MSK as applied to a specific ciphertext is not the share itself │
│ │ — revealing partial_i = enc^{s_i} does not reveal s_i). Storing them in the JMT alongside the ciphertext is safe. │
└────────────────┴─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
★ Insight ─────────────────────────────────────
The security statement at the end deserves emphasis: partial_i = enc^{s_i} is not the share s_i. Given enc and partial_i, recovering s_i
requires solving discrete log on X25519 — computationally infeasible. This means partials can be published freely without weakening threshold
security. The JMT-as-partial-store design exploits this property: every operator reads every partial, but the shares themselves remain secret.
This is the same property that lets threshold signature schemes (like FROST) publish partial signatures without leaking key material.
─────────────────────────────────────────────────
Costs:
- Stream A storage layout extension (not a refactor — added field)
- Stream D partial-computation-on-apply logic (~few hundred LoC across operator + gateway)
- Bootstrap invariant: DKG must complete before secrets writes are accepted (enforced at gateway)
- One Phase 1 MVP "partial backfill" job for dynamic resharing events
Gains:
- Shared HPKE key rotation for secrets ceases to be a problem (secrets aren't on shared HPKE anymore)
- Unified encryption model across all three namespaces (identity/confidential/secrets all threshold-sealed)
- Native PSS + dynamic resharing for secrets (same mechanics as identity/confidential)
- No re-upload ever under normal rotation
- No TEE re-encryption complexity (Option C)
- No new crypto primitive (Option B)
- No 3-phase protocol (the concern that drove the question)
design still valid for threshold-migrated namespaces (pre-stored partials avoid 3-phase)\n \n The user then requested a text-only
summary via CRITICAL directive, which is what this response fulfills.\n\n9. Optional Next Step:\n \n Based on the user's most recent
explicit decision "we will gradually migrate fully to threshold decryption from shared hpke encryption key. Until threshold decryption
completes, we will continue to use the shared hpke key, but let's omit/admin no key rotation during this migration period", the next step is
to confirm the Q3 thread is closed with the locked gradual-migration + no-rotation policy, and resume the grill-me interview by firing the
next adversarial branch.\n \n From my prior message: "Next adversarial branch: Delete semantics under per-write witnesses (who
authorizes; tombstones vs append-only; interaction with signed-RPC read proofs) ... Which one do you want to fire, or should I pick the one
most at risk of corner-painting the in-flight implementation (my vote: delete semantics, because it's entangled with the witnesses we just
locked in Q1)?"\n \n After the user approves resumption, the planned immediate action is: (a) acknowledge Q3 locked under
gradual-migration-no-rotation, (b) briefly restate the implied spec updates (§2 migration language, §F migration path, no §Q rotation
question, §5.3 dual-scheme documentation), then (c) fire the delete-semantics branch as the next grill-me question — walking through who
authorizes deletion, append-only JMT vs tombstone markers, the interaction of delete with per-write witnesses locked in Q1, and how deletes
appear to signed-RPC read proofs (weak vs strong mode).\n"}
PostCompact [bash "${CLAUDE_PLUGIN_ROOT}/hooks/python-launcher.sh" "${CLAUDE_PLUGIN_ROOT}/hooks/run.py"
skills/token-optimizer/scripts/measure.py quality-cache --force --quiet] completed successfully: You already have a custom status line
configured.
To integrate quality scoring, add this to your status line script:
// Read context quality score
const qFile = path.join(os.homedir(), '.claude', 'token-optimizer', 'quality-cache.json');
let qScore = '';
if (fs.existsSync(qFile)) {
try {
const q = JSON.parse(fs.readFileSync(qFile, 'utf8'));
const s = q.score;
if (s < 50) qScore = ' | \x1b[31mContextQ:' + s + '\x1b[0m';
else if (s < 70) qScore = ' | \x1b[33mContextQ:' + s + '\x1b[0m';
else qScore = ' | \x1b[2mContextQ:' + s + '\x1b[0m';
} catch (e) {}
}
// Append qScore to your output
⎿  Read .claude/rules/error-selectors.md (24 lines)
⎿  Referenced file crates/gateway/src/handler/mod.rs
⎿  Read .claude/rules/incidents-inbox.md (24 lines)
⎿  Read .claude/rules/agent-guide.md (137 lines)
⎿  Read docs/CLAUDE.md (7 lines)
⎿  Skills restored (superpowers:brainstorming, save-progress, commit-git, grill-me, pr, docs-sync, superpowers:writing-plans)
❯ continue
⏺ Q3 locked. Shared HPKE remains for Phase 1 MVP with admin-frozen key (no rotation); threshold migration runs gradually, and threshold-migrated
namespaces get native rotation via PSS once their migration completes.
Queued spec deltas (apply at end of interview):
- §2 Trust Model: add gradual-migration language; shared HPKE admin-frozen during migration window
- §5.1–5.3: unified PrivacyEnvelope { version, scheme, recipient_key_hash, ciphertext } across all three namespaces (scheme ∈ {SharedHpke,
ThresholdMpk})
- §F Future Work: completion of shared-HPKE → threshold migration; removal of shared HPKE code path
- §Q: remove rotation open-question (resolved)
- Plan Stream B: single envelope type shared across all three namespaces' writers; apply-time rejection on recipient_key_hash mismatch with
typed RecipientKeyMismatch error
★ Insight ─────────────────────────────────────
Admin-freezing rotation during the migration window is the pragmatic move. Rotation is the #1 source of cryptographic bugs in distributed
systems — deferring it to the threshold scheme (where PSS handles it natively via share-refresh with MPK invariant) dodges a whole class of
slashing-adjacent bugs in Phase 1. Cost: one governance knob (operator set decides when a namespace has fully migrated). Acceptable
pre-mainnet.
─────────────────────────────────────────────────
---
Next branch: JMT delete semantics
Under Q1, every write carries an auth_witness over keccak256(write_kind || leaf_key || leaf_value_hpke || nonce || subtree_id || chain_id).
Deletes need the same rigor — "just write a NULL leaf" without a design is how invariants leak.
Q4: How does the JMT represent a deleted leaf?
Three options:
(a) Pure delete — leaf_key removed from the tree; merkle proof of absence is path-to-empty-node.
- Tree stays minimal; no forensic record inside JMT (deltas are the only trail)
- Proof shape changes: readers must handle inclusion vs absence
(b) Tombstone — leaf_key retained, leaf_value_hpke = TOMBSTONE_SENTINEL (e.g., 0xFF..FF)
- Tree structure stable; uniform proof shape; metadata leaked (key existed at some point)
- ~40 bytes per tombstone (negligible at expected churn rates)
(c) Hybrid — tombstone for N deltas, then pure-delete via snapshot compaction beyond retention window
- Best of both, but adds a compaction boundary = new attack surface
My vote: (b) tombstone. Reasoning specific to this codebase:
1. Signed-RPC read proofs stay uniform. §11 read path returns (data, state_root, block, sig). Tombstone keeps proof shape as "inclusion proof,
value=SENTINEL" for both weak and strong modes. Pure-delete forces readers and challenger to branch on inclusion vs absence — two code paths,
two audit surfaces.
2. Challenger full-replica is bit-for-bit deterministic. Challenger re-walks deltas to compute ground-truth state_root. If operator
pure-deletes and challenger tombstones (or vice versa), roots diverge despite semantic agreement. Tombstone is one canonical representation —
the delta bytes determine the outcome exactly.
3. §S.3 "no bad commit can reach on-chain" holds. Any operator deviating on delete representation produces a divergent state root, caught at
BLS quorum on commit. Tombstone removes ambiguity at the representation layer, before quorum.
4. Storage is cheap. 40 bytes per tombstone. 100k delete-and-re-add events ≈ 4MB/year per operator. Redb handles it comfortably; moka cache
even more so.
5. Privacy leak is already present in EigenDA delta stream. A tombstone in JMT reveals "key existed"; the immutable delta history on EigenDA
already reveals every write-then-delete sequence. Tombstone adds no new leak.
Anticipated objection — GDPR right-to-erasure: tombstone doesn't block it. Phase 1 MVP treats JMT + delta as append-only for availability.
Right-to-erasure is a retention-layer concern (snapshot compaction past some horizon, EigenDA blob TTL expiry). Deferred to §F Future Work.
Secondary hazard I'm flagging now (but not asking you to resolve yet): with tombstone, the same leaf_key can transition Live → TOMBSTONE → Live
→ TOMBSTONE → .... Nonce monotonicity per signer keeps replay out, but there's a subtle attack on grants — a granter revoking via TOMBSTONE,
then later re-granting the same leaf_key without the grantee re-accepting, could cause a policy eval to suddenly see data after the grantee had
logically "forgotten" it. We'll tackle that in Q5 (who authorizes revocation of grants under confidential/*).
Your read on Q4: (a), (b), or (c)?
✻ Churned for 1m 54s
❯ For q4, agree on (b). Also, One question (back to the state tree discussion of having 3 subtrees vs just 1 subtree), we decided to go with 1
subtree with key-prefix. Agree having a single state root is much simpler operationally and cheaper gas wise. for the commit frequency, we're
not going to post the state root if its the same right? itd reduce costs. Also, in this case, can the implementation still stay separated in
terms of subtrees but when onchain committing, go with the root-of-roots approach? (one state root commit tx)
⏺ Q4 locked: (b) tombstone.
Spec delta: §4 State Tree — add "Deletion represented by writing leaf_value_hpke = TOMBSTONE_SENTINEL (0xFF..FF) under original leaf_key. JMT
structure is append-only at the key level; value transitions Live → TOMBSTONE → Live are valid and nonce-monotonic per signer." Plan Stream A:
add tombstone sentinel constant + test matrix (live→tombstone→live cycles, nonce monotonicity, proof-shape uniformity).
---
Topology cleanup — two follow-ups
A. Skip on-chain commit if state_root_new == state_root_committed
Yes, agree. The commitStateRoot tx is only called when root actually changes. Reasoning and edge cases:
1. Gas saved is real. Writing a bytes32 storage slot on L2 is ~5k–20k gas; over a year of quiet periods, this compounds.
2. Strong-mode reads still valid. Strong-mode proves against last-committed root. If state hasn't changed for 5 minutes, last-committed root is
5 minutes old — but the data still matches that root, so the proof is correct. Staleness-of-the-root is a feature here, not a bug: data didn't
change, so "stale" root is accurate.
3. Liveness signal comes from task responses. Gateway + operators are already submitting respondToTask txs continuously — that's the real
heartbeat. No need for a separate state-commit heartbeat.
4. BLS quorum convergence still works. At t=120s, all operators compute new_state_root; if unchanged, they don't aggregate or submit. No race;
no partial-quorum failure mode.
One caveat to flag in §S Security: "No state commit for N minutes" is indistinguishable from "operator set offline." If an external indexer
wants a pure liveness proof, it must watch task traffic, not state commits. Document this explicitly so monitoring doesn't misclassify a quiet
system as a degraded one.
Spec delta: §6 Commit Protocol — "State root is committed on-chain only when new_root != last_committed_root. Quiet periods produce no commit
tx. Liveness is signaled via task-response traffic, not state commits." Add one-line warning in §S about monitoring implications.
---
B. Root-of-roots with separated subtree implementations
Recommend against root-of-roots at the JMT layer. Keep unified JMT + prefix namespaces (Q2 Option C locked). But absolutely separate the code
at the crate/module layer.
What you're asking has two readings, and I want to disentangle them before answering:
Reading 1 — root-of-roots at the on-chain layer: three separate JMT trees (per namespace), each with its own root; commit root_of_roots =
keccak256(r_identity || r_confidential || r_secrets) on-chain.
Reading 2 — modular implementation but single JMT: one unified JMT underneath; three separate Rust handler modules (one per namespace) that
each own leaf schema, auth_witness rules, and delta-format contribution. The underlying JMT is shared.
My strong recommendation: Reading 2, not Reading 1.
Why not root-of-roots (Reading 1):
1. New four-site-commitment surface. Any disagreement across operator / gateway / challenger / contract on subtree order (identity ||
confidential || secrets vs any permutation) produces silent state root divergence — exactly the class of bug flagged in
.claude/rules/lessons.md "Four-site commitment." Three new constants, three new verification sites.
2. Reads need two merkle paths. To prove identity/alice/linked_domain=X, client verifies (a) leaf in identity subtree produces r_identity, (b)
r_identity in (r_id, r_conf, r_sec) concat produces root_of_roots. Proof size doubles; verifier code doubles.
3. Cross-namespace atomicity is harder. If a policy eval touches identity + confidential in the same delta, you now have a 2-phase commit:
update both subtrees, then recompute root-of-roots. In a unified JMT, it's one tree update — one root.
4. Challenger replica doubles in complexity. Instead of one JMT state machine, challenger maintains three subtree states + a root-of-roots
derivation. More surface for reconstruction bugs.
5. Operational benefit is near zero for Phase 1 MVP. You wanted independent rotation cadences and storage substrates per namespace — but Q3
just locked shared cadence + unified encryption migration strategy, so the flexibility pays for nothing.
Why modular handlers on unified JMT (Reading 2) gets you what you want:
// crate state-tree, one JMT
pub struct StateTree { jmt: JmtInstance, ... }
// crate state-tree::identity — owns identity leaf schema + auth
pub mod identity {
pub const SUBTREE_ID: u8 = 0x01;
pub fn leaf_key(subject: Address, domain: &str) -> Vec<u8> { ... }
pub fn verify_witness(...) -> Result<()> { ... }
}
// Similarly state-tree::confidential and state-tree::secrets
You get:
- Per-namespace code isolation — identity handler can't accidentally touch confidential witness verification.
- Per-namespace observability — filter by leaf_key[0] == SUBTREE_ID::identity for metrics, cache hit rates, churn measurements.
- Per-namespace testing — each handler tested in isolation with mock JMT trait.
- Single state root — no concat-order bug; one proof; cross-namespace writes are atomic at the tree level.
★ Insight ─────────────────────────────────────
The general principle here mirrors how crates/core/src/dkg/ is organized: dealer.rs, combine.rs, refresh.rs, keystore.rs are separate modules
with distinct responsibilities, but they all operate over the same FrostKey / Share primitives — one shared type system, multiple handler
modules. That pattern scaled well; it avoids cross-module corruption because the primitive types enforce the invariants. Applying the same
shape to state-tree handlers over a unified JMT buys the code separation you want without introducing a second Merkle aggregation layer.
─────────────────────────────────────────────────
Edge case where root-of-roots would be worth it: If Phase 3 ever introduces different operator sets for different namespaces (e.g., a
privacy-regulator-operated subset signs only confidential/* commits), then root-of-roots becomes necessary because each subtree has its own
quorum. But per Q2 (Option C locked: single operator set forever), that future is explicitly out of scope. If we ever revisit, it's a
spec-major-version change, not a Phase 1 MVP concern.
Spec deltas:
- §4 State Tree: explicitly name "unified JMT with key-prefix namespaces; single state root; no root-of-roots aggregation." Document SUBTREE_ID
constants (identity=0x01, confidential=0x02, secrets=0x03) with a note that they participate in the auth_witness keccak256 input per Q1.
- §10 Crate-Level Architecture: state-tree crate exposes StateTree (unified JMT) + submodules identity, confidential, secrets, each owning its
leaf schema + auth_witness verification. Operator / gateway / challenger consume the handler modules, not the raw JMT.
- Plan Stream A: reshape tasks to "one state-tree crate with three handler submodules" instead of ambiguous per-namespace split.
---
Confirm this closes topology cleanup, and I'll fire the next branch. My vote for next: Phase 1 MVP detection-only slashing seam — D12/D13/E5 is
documented as "detection-only" today with real on-chain JMT proof-and-slash deferred to post-MVP (NEWT-810). That seam is where design debt
accrues silently because "detection only" sounds safe, but the schemas we pick now for delta blobs + state commits will either enable or block
the real slashing path with zero schema churn later. If we get it wrong, NEWT-810 forces a breaking migration.
Confirm and go?
✻ Sautéed for 2m 3s
※ recap: Adversarial review of the Private Data Storage Phase 1 spec and plan; Q4 tombstone locked and topology answered with skip-if-unchanged
commits plus unified JMT over modular handlers. Next: confirm these close, then fire the detection-only slashing seam question.
❯ confirmed and agreed. proceed
⏺ Topology cleanup locked:
- §4: unified JMT with key-prefix namespaces; SUBTREE_ID constants identity=0x01, confidential=0x02, secrets=0x03 participate in auth_witness
keccak input
- §6: state root committed on-chain only when new_root != last_committed_root; task traffic is the liveness signal
- §10: state-tree crate exposes one StateTree + submodules identity / confidential / secrets owning per-namespace leaf schema + witness
verification
- §S: document monitoring implication — absence of state commits ≠ liveness failure
- Plan Stream A: reshape tasks from "per-namespace tree" to "unified JMT + three handler submodules"
---
Q5: Detection-only slashing seam — what does the Phase 1 BLS state-commit signature bind?
The question in one line. NEWT-810 will build on-chain JMT proof-and-slash on top of Phase 1 state commits. If the commit signature binds too
little, NEWT-810 forces a breaking migration of every historical commit. If it binds everything NEWT-810 needs, NEWT-810 is purely additive
contract code. You get one shot at the signature domain — it's signed into every commit from day one.
Three candidate scope levels for the BLS-signed message:
(a) Minimal — keccak256("COMMIT_V1", state_root, block_number)
- Adequate for off-chain detection today
- Breaks NEWT-810: no binding to which deltas produced this root, no chain of commits, no cross-chain scope, no operator-set identity. Every
gap is an equivocation attack surface.
(b) Proof-ready — keccak256("COMMIT_V1", state_root, previous_state_root, delta_blob_hash, block_number, chain_id, operator_set_hash)
- NEWT-810 is additive: contract verifies (commit_bytes, BLS_sig, merkle_proof) → slashes.
(c) Maximal (belt-and-suspenders) — (b) + writes_merkle_root + timestamp
- Marginal benefit: delta_blob_hash already pins writes bit-for-bit; contract can re-derive writes_merkle_root from delta bytes when it needs
to.
My strong vote: (b). Each field blocks a specific equivocation:
┌─────────────────────┬───────────────────────────────────────────────────────────────────────────────────────────────┐
│ Field │ Equivocation it blocks │
├─────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ "COMMIT_V1" │ V2 commit bytes replayed as V1 (domain separator discipline) │
├─────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ state_root │ The content being committed (baseline) │
├─────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ previous_state_root │ Commit-reordering / skip-commit attacks (chains roots into a ledger) │
├─────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ delta_blob_hash │ "Two different deltas producing the same root" — binds commit to exact write bytes on EigenDA │
├─────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ block_number │ Old-commit replay at a new block │
├─────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ chain_id │ Cross-chain replay (matches .claude/rules/lessons.md "Every cross-service block reference") │
├─────────────────────┼───────────────────────────────────────────────────────────────────────────────────────────────┤
│ operator_set_hash │ Historical-set replay (resigned operator's old sig re-used after set rotation) │
└─────────────────────┴───────────────────────────────────────────────────────────────────────────────────────────────┘
Without previous_state_root, an operator can sign root_A at block B1 and later sign root_C at block B2 skipping root_B — provable equivocation
in (b), invisible in (a). Without delta_blob_hash, operators can equivocate on "which delta produced this root" — the BLS commit agrees on the
root but operators disagree on the underlying writes. Without operator_set_hash, a quorum that legitimately signed one root at set version V
can have their sig replayed into a prova-and-slash attempt after rotation to V+1 where the signers are no longer operators.
Dependent decisions that fall out of this choice (to resolve in follow-ups, not now):
1. Delta blob completeness — for delta_blob_hash to be meaningful, the EigenDA blob must be self-contained and byte-stable: (sequence_no,
previous_state_root, next_state_root, writes[], tombstones[], chain_id, operator_set_hash) with each write carrying its full auth_witness. No
pointers to DB rows that could prune.
2. Auth_witness version byte — pin witness_version: u8 = 1 as first byte of the witness struct. Use raw ECDSA(keccak256(...)), not EIP-712, so
a future verifier can ecrecover with no struct-hash complexity.
3. Evidence retention — challenger must persist full commit bytes + BLS sig + delta blob bytes + offending witness bytes indefinitely for year
one. At ~100 KB per delta and ~10 violations per month expected on hostile inputs, storage is ~12 MB/year — trivial. Without retention, by the
time NEWT-810 ships, the evidence is gone even if the detection fired.
4. Challenger replica determinism — the challenger's JMT replica must produce bit-identical state roots to the on-chain verifier's
reconstruction. Pin the JMT library version + serialization format in Cargo.toml with =x.y.z (not ^), and add a test that commits the same
delta stream against two independent replicas and asserts root equality.
★ Insight ─────────────────────────────────────
This is structurally the same lesson as "Four-site commitment" in .claude/rules/lessons.md, applied temporally rather than across components.
There, the failure mode was disagreement across operator/gateway/challenger/contract at a single point in time. Here, the failure mode is
disagreement between Phase 1's signature format and NEWT-810's verifier expectations across time. Both are prevented by the same rule: bind
everything a verifier could possibly need into the signed bytes, and version-tag the schema. The cost of over-binding is one-time (design
effort); the cost of under-binding is a migration that touches every historical record.
─────────────────────────────────────────────────
Secondary hazard I want to flag but not litigate yet: "detection-only" has a product-side failure mode that schema design can't fix — if we
ship Phase 1 without real on-chain slashing, operators have zero economic cost for equivocation beyond reputation. Pre-mainnet that's fine, but
the instant real value flows through privacy-gated tasks, the "detection-only" window becomes a trust-us period. Worth flagging explicitly in
§S and possibly in the launch plan, so the product decision of "when do we unlock flows that assume real slashing" is deliberate rather than
drift.
Does (b) hold, or do you want (c) / reconsider (a)?
✻ Worked for 1m 53s
@denniswon

denniswon commented May 4, 2026

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Reviewing the full conversation arc — PR #612 audit landed early, PR #613 review surfaced a deeper question about the signed-read trust
model, that question opened up the operator RPC surface, and we ended up pivoting to NEWT-1175 / PR #615 as the structural precondition.
Here is the alignment, layer by layer.

★ Insight ─────────────────────────────────────
The drift wasn't accidental. PR #613 shipped the gateway-coordinated response model (status/commit_sig overlay), but the deeper question
— who is authoritative over the read request itself — only crystallized after challenging the "encrypted blob is fine" claim. That
challenge surfaced that user-ECDSA and operator-signature are different artifacts doing different jobs, which then exposed that the
whole operator RPC surface had inconsistent auth. NEWT-1175 became the precondition because epoch-aligned caching is what makes pulling
auth back to the gateway operationally cheap.
─────────────────────────────────────────────────

  1. Conversation arc — what shipped, what remains

┌───────┬────────────────────────────────────────────────────────────┬─────────────────────────────────────┐
│ Phase │ Topic │ Status │
├───────┼────────────────────────────────────────────────────────────┼─────────────────────────────────────┤
│ A │ PR #612 — state-commit operator-majority + doc dissolution │ Shipped (46d0f734) │
├───────┼────────────────────────────────────────────────────────────┼─────────────────────────────────────┤
│ B │ PR #613 — gateway-coordinated signed-read response model │ Shipped, but only the response side │
├───────┼────────────────────────────────────────────────────────────┼─────────────────────────────────────┤
│ C │ Auth model overhaul for the request side of signed-read │ Aligned, not yet built │
├───────┼────────────────────────────────────────────────────────────┼─────────────────────────────────────┤
│ D │ Operator RPC surface uniformity (7 unguarded endpoints) │ Aligned, not yet built │
├───────┼────────────────────────────────────────────────────────────┼─────────────────────────────────────┤
│ E │ Cryptographic primitive choice (Ed25519 vs BLS) │ Aligned: keep Ed25519 │
├───────┼────────────────────────────────────────────────────────────┼─────────────────────────────────────┤
│ F │ Future access-list / threshold-decrypted reads │ Aligned: separate endpoint │
├───────┼────────────────────────────────────────────────────────────┼─────────────────────────────────────┤
│ G │ NEWT-1175 / PR #615 — OperatorRegistry epoch-bounded queue │ Spec drafted, 3 sign-off items open │
├───────┼────────────────────────────────────────────────────────────┼─────────────────────────────────────┤
│ H │ Phase 3 — epoch-aligned caching on gateway/operator │ Blocked on G │
└───────┴────────────────────────────────────────────────────────────┴─────────────────────────────────────┘

  1. PR #613 trust model — aligned vs shipped (the drift)

What shipped in PR #613:

  • ReadMode removed from request schema, ECDSA preimage, and response
  • Operator always populates proof_bytes for non-empty trees (was Strong-only)
  • Operator always emits status: pending, commit_sig: None
  • Gateway overlays commit_sig (Redis-first, calldata fallback) and promotes status: confirmed when (root, sequence_no) is anchored on
    StateCommitRegistry
  • GatewaySignedReadResponse wrapper deleted; gateway returns SignedReadResponse directly
  • READ_MODE_UNSUPPORTED outcome removed (cardinality 32 → 28)
  • Domain separator reset to signed_read_v1 (commit 28472aa6) — pre-production reset valid because no preimage hit mainnet yet

What we aligned on but did NOT ship in PR #613:

  • Closing Path A (direct-to-operator from clients)
  • Replacing per-request user ECDSA in SignedReadRequest with task-generator EIP-712 signature signed by the gateway
  • Removing NonceTracker (~120 LOC), InFlightTracker + InFlightGuard (~80 LOC), and the per-signer / global caps
  • Adding API-key auth + rate limit to gateway newt_signedRead (consistent with the rest of the PDS surface)
  • Keeping operator_sig (Ed25519) and operator_ed25519_pubkey unchanged

The reasoning we landed on for why this is safe:

  1. Path A closed → gateway is the only legitimate caller of newt_signedRead
  2. Gateway gates with API key (rate limit at customer/policy-client tier)
  3. Data is encrypted at rest at the JMT-leaf layer (Secrets fully, Confidential mostly, Identity is metadata pointing at encrypted
    off-chain blobs) — replay leaks at most existence + content_hash deltas, no plaintext
  4. operator_sig (Ed25519) stays because it does cross-chain accountability work — it binds this exact ciphertext was at this leaf-key
    when JMT was at version sequence_no, root R, which is needed for the Pending tier where on-chain BLS commit hasn't landed yet
  5. User ECDSA was doing authorization ("is this request permitted to ask?"); the gateway's task-generator EIP-712 sig + API-key gate
    replace that role cleanly

The crucial distinction we hammered down: per-request user ECDSA and operator response signature are different artifacts. Dropping the
first does not require dropping the second.

  1. Open findings from PR #613 audit (still applicable)

These were classified during the audit but not addressed in #613:

┌─────┬──────────┬──────────────────────────────────────────────────────────────────────┬───────────────────────────────────────────┐
│ # │ Severity │ Finding │ Fix │
├─────┼──────────┼──────────────────────────────────────────────────────────────────────┼───────────────────────────────────────────┤
│ H1 │ HIGH │ broadcast_first_success has no end-to-end timeout │ Wrap in tokio::time::timeout(800ms, ...) │
│ │ │ (crates/gateway/src/rpc/api/signed_read.rs:64) │ │
├─────┼──────────┼──────────────────────────────────────────────────────────────────────┼───────────────────────────────────────────┤
│ H2 │ HIGH │ get_provider rebuilt per cert-fetch call (line 183) │ Cache provider on ChainService │
├─────┼──────────┼──────────────────────────────────────────────────────────────────────┼───────────────────────────────────────────┤
│ M2 │ MED │ fetch_commit_state_root_calldata has no timeout │ Wrap in tokio::time::timeout(500ms, ...); │
│ │ │ │ degrade to Pending │
├─────┼──────────┼──────────────────────────────────────────────────────────────────────┼───────────────────────────────────────────┤
│ M3 │ MED │ JSON to_value/from_value round-trip on hot path │ Defer until measured │
└─────┴──────────┴──────────────────────────────────────────────────────────────────────┴───────────────────────────────────────────┘

Aligned: these get implemented in the Phase 1 sequence (after NEWT-1175 ships). The H1/M2 fixes are non-negotiable for a 1s SLO because
both are unbounded async waits on the hot path.

  1. Operator RPC surface — alignment for Phase 1

Verified surface (16 methods):

┌─────────────────────────────────────────┬─────────────────────┬───────────────────────────────────────┬──────────────────────────┐
│ Endpoint │ Caller │ Existing auth │ Action │
├─────────────────────────────────────────┼─────────────────────┼───────────────────────────────────────┼──────────────────────────┤
│ newt_fetchPolicyData │ gateway │ task-generator EIP-712 │ keep │
├─────────────────────────────────────────┼─────────────────────┼───────────────────────────────────────┼──────────────────────────┤
│ newt_evaluateAndSign │ gateway │ task-generator EIP-712 │ keep │
├─────────────────────────────────────────┼─────────────────────┼───────────────────────────────────────┼──────────────────────────┤
│ newt_dkgRound{1,2,3}, newt_dkgCancel, │ gateway (DKG │ task-generator gated via │ │
│ newt_dkgRefresh{Round,Apply} │ coordinator) │ task_generator_cache │ keep — already gated │
│ │ │ (operator/src/core.rs:1024-1064) │ │
├─────────────────────────────────────────┼─────────────────────┼───────────────────────────────────────┼──────────────────────────┤
│ newt_simulatePolicyData{,WithClient} │ gateway │ none │ add task-gen gate │
├─────────────────────────────────────────┼─────────────────────┼───────────────────────────────────────┼──────────────────────────┤
│ newt_simulatePolicy │ gateway │ none │ add task-gen gate │
├─────────────────────────────────────────┼─────────────────────┼───────────────────────────────────────┼──────────────────────────┤
│ newt_validateSecretsSchema │ gateway │ none │ add task-gen gate │
├─────────────────────────────────────────┼─────────────────────┼───────────────────────────────────────┼──────────────────────────┤
│ newt_getPublicKey │ gateway (startup + │ none │ add task-gen gate │
│ │ HPKE resolution) │ │ (recon-resistance) │
├─────────────────────────────────────────┼─────────────────────┼───────────────────────────────────────┼──────────────────────────┤
│ newt_getStateCommitProposal │ aggregator │ 30s timeout only │ add task-gen gate │
│ │ (gateway-embedded) │ │ │
├─────────────────────────────────────────┼─────────────────────┼───────────────────────────────────────┼──────────────────────────┤
│ newt_signStateCommit │ aggregator │ 30s timeout only │ add task-gen gate │
│ │ (gateway-embedded) │ │ │
├─────────────────────────────────────────┼─────────────────────┼───────────────────────────────────────┼──────────────────────────┤
│ │ │ │ rebuild: replace user │
│ newt_signedRead │ gateway (Path A*) │ per-request user ECDSA + NonceTracker │ ECDSA with gateway │
│ │ │ + InFlightTracker │ task-gen sig; delete │
│ │ │ │ trackers │
└─────────────────────────────────────────┴─────────────────────┴───────────────────────────────────────┴──────────────────────────┘

Aligned: 8 of 16 already guarded; Phase 1 extends the verify_task_generator_signature_cached pattern to the other 8. Extract
gateway_authenticated_method! helper, apply uniformly.

Aligned but worth restating: DKG endpoints stay on existing peer-to-peer auth — verified that the gateway IS the orchestrator
(crates/gateway/src/dkg/coordinator.rs:312, 419) and operator-side task_generator_cache already accepts gateway-signed messages. No
change.

  1. Cryptographic primitive choice — D1 / D2 alignment

D1: Keep operator_sig as Ed25519 (do NOT switch to BLS aggregate per leaf-read)

Aligned reasoning:

  • operator_sig does accountability, not consensus. The state root is already BLS-aggregated via the 120s commitStateRoot cadence —
    re-running BLS per leaf read is redundant.
  • JMT inclusion proof handles authenticity (math, no signature needed). Ed25519 binds the operator who served this leaf to the served
    (root, content_hash, sequence_no).
  • Switching to BLS would 5x latency (single-op ~100-200ms p50 → quorum ~500ms-1s+) for a guarantee the JMT-proof + on-chain commit
    already provides.
  • Single-operator equivocation is more detectable with Ed25519, not less — a divergent signature against the on-chain commitStateRoot at
    the same seq_N IS the fraud proof.

Hybrid we keep:

  • Ed25519 per-operator → fast tier (Pending, real-time UI)
  • BLS aggregate via commit_sig overlay → confirmed tier (audit-trail, cross-chain)

D2: Redis stays regardless of D1

Aligned reasoning:

  • Redis caches the state-commit BLS aggregate during the ~30-45s window between operator quorum signing and on-chain commitStateRoot
    finalization.
  • This window exists on a 120s cadence regardless of read activity.
  • Per-read BLS would add a new aggregate at request cadence — does not remove the state-commit aggregate from Redis.
  • Per-chain Redis key: pds:commit_sig:{chain_id}:{sequence_no} with EX 600.

Future access-list / threshold-decrypted reads

Aligned: separate endpoint, separate primitive.

newt_signedRead (current, Phase 1)
→ ciphertext + JMT proof + Ed25519 op_sig + (BLS commit_sig overlay)
→ fast (~100-200ms p50), single operator
→ use case: real-time UI reads, evidence trails

newt_thresholdDecryptedRead (future, NEWT-1177 / similar)
→ plaintext + JMT proof + BLS aggregate over plaintext + commit_sig
→ slow (~500ms-1s+), quorum coordination, threshold + BLS
→ use case: access-list-gated decryption (regulator, consent flow, key recovery)

The two coexist — they answer different questions. Current signedRead's Ed25519 doesn't preclude the future endpoint; the wire-level
primitive difference surfaces the trust-model difference.

  1. NEWT-1175 / PR #615 — OperatorRegistry epoch-bounded queue (the precondition)

Why it's the precondition for Phase 3 caching: The gateway's operator-routing cache and operator's task-generator gate cache both rely
on knowing "the set in force right now." Today both refresh on a periodic timer because the on-chain set can mutate at any block. With
epoch-bounded mutations, both caches refresh once per EpochAdvanced event — zero RPC calls per signed-read for auth checks in steady
state.

Aligned spec parameters:

┌─────────────────────┬──────────────────────────────────────────────────────────┬─────────────────────────────────────────────────┐
│ Parameter │ Value │ Source │
├─────────────────────┼──────────────────────────────────────────────────────────┼─────────────────────────────────────────────────┤
│ epochDurationBlocks │ 7200 (L1/Sepolia/31337/31338), 43200 (Base 84532) │ contracts/newton_prover_config.{env}.json │
│ │ │ .epoch_blocks │
├─────────────────────┼──────────────────────────────────────────────────────────┼─────────────────────────────────────────────────┤
│ Epoch 0 semantics │ Frozen baseline at upgrade — captures existing whitelist │ confirmed │
│ │ + task-gen set verbatim │ │
├─────────────────────┼──────────────────────────────────────────────────────────┼─────────────────────────────────────────────────┤
│ Queueing starts │ Epoch 1 onward │ confirmed │
├─────────────────────┼──────────────────────────────────────────────────────────┼─────────────────────────────────────────────────┤
│ Emergency override │ None now; NEWT-1176 layers Security Council multisig via │ confirmed │
│ │ existing EigenLayer ejector slot │ │
├─────────────────────┼──────────────────────────────────────────────────────────┼─────────────────────────────────────────────────┤
│ Storage layout │ Upgrade-safe append at slot 257+; redeploy fallback │ verified via │
│ │ acceptable │ .storage-layouts/OperatorRegistry.json │
├─────────────────────┼──────────────────────────────────────────────────────────┼─────────────────────────────────────────────────┤
│ Existing ejector │ EigenLayer-defined, already ejects mid-epoch — de-facto │ confirmed │
│ path │ override until NEWT-1176 │ │
└─────────────────────┴──────────────────────────────────────────────────────────┴─────────────────────────────────────────────────┘

Aligned mutator changes:

┌───────────────────────────┬────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ Function │ Change │
├───────────────────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ removeFromWhitelist │ Replaced by queueRemoveFromWhitelist — effective at next epoch │
├───────────────────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ addTaskGenerator │ Replaced by queueAddTaskGenerator — effective at next epoch (admit-fast for task gens dangerous: it's │
│ │ an authorization grant) │
├───────────────────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ removeTaskGenerator │ Replaced by queueRemoveTaskGenerator — effective at next epoch │
├───────────────────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ addToWhitelist │ Stays immediate — admission is permissive (operator still needs to register+stake), cache staleness is │
│ │ benign │
├───────────────────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ _beforeDeregisterOperator │ Now requires queueDeregister() first; ejector and owner bypass; approval consumed on use │
├───────────────────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ setEpochDurationBlocks │ Queues into _pendingEpochDurationBlocks, applies at next advance │
├───────────────────────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ applyPendingChanges() │ New permissionless function; flips state when block window elapsed │
└───────────────────────────┴────────────────────────────────────────────────────────────────────────────────────────────────────────┘

Aligned events:

  • EpochAdvanced(uint32 newEpoch, uint64 startBlock, uint32 durationBlocks) — primary cache-invalidation signal
  • WhitelistRemovalQueued, TaskGeneratorAdditionQueued, TaskGeneratorRemovalQueued — pre-warm signals
  • OperatorDeregistrationQueued, EpochDurationBlocksQueued

Aligned storage append (slot 257+):

  • Slot 257: packed (_currentEpoch || _epochStartBlock || _epochDurationBlocks) — saves SLOAD on permissionless applyPendingChanges()
  • Slots 258-260: pending-change queues (whitelist removals, task-gen additions, task-gen removals) keyed by epoch
  • Slot 261: _approvedDeregisterEpoch[address]
  • Slot 262: _pendingEpochDurationBlocks
  • Slots 263-299: __gap[37] reserve (~37 future fields without redeploy)

Three sign-off items still open on NEWT-1175:

┌─────┬────────────────────────────────────────────────┬────────────────────────────────────────────────────────────────────────────┐
│ # │ Question │ My recommendation │
├─────┼────────────────────────────────────────────────┼────────────────────────────────────────────────────────────────────────────┤
│ 1 │ addToWhitelist immediate vs queued? │ Immediate — admission permissive, cache staleness benign │
├─────┼────────────────────────────────────────────────┼────────────────────────────────────────────────────────────────────────────┤
│ 2 │ setEpochDurationBlocks queue vs immediate? │ Queue — preserves "the duration that started this epoch ends this epoch" │
│ │ │ invariant │
├─────┼────────────────────────────────────────────────┼────────────────────────────────────────────────────────────────────────────┤
│ 3 │ Operator self-deregister UX (24h wait │ Yes — two-phase queueDeregister() → deregisterOperator() after epoch │
│ │ acceptable?) │ advance │
└─────┴────────────────────────────────────────────────┴────────────────────────────────────────────────────────────────────────────┘

★ Insight ─────────────────────────────────────
The asymmetry (admit-fast on addToWhitelist, queue on addTaskGenerator) is intentional and load-bearing. Whitelist add is permission to
try to register; the operator still needs to stake and run registerOperator before they show up in the off-chain quorum view. Task-gen
add is the actual authorization grant for signature acceptance — admit-fast there means a compromised owner can flood-add fake task
generators whose signatures get accepted on-chain immediately while caches haven't refreshed, creating drift between on-chain and
off-chain authorization views.

The _approvedDeregisterEpoch consume-on-use (delete after gate passes) is the closed-form invariant: every successful deregister
requires a fresh queueDeregister(). Without it, a re-onboarded operator carries a stale stamp and could deregister mid-epoch on the next
attempt.
─────────────────────────────────────────────────

  1. The Phase 1-4 sequence (gated on NEWT-1175 merge)

Once NEWT-1175 merges, this is the planned PR sequence:

┌─────┬──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ PR │ Scope │
├─────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ 1 │ Rust-side EpochCache wrapper + chain-watcher subscription to EpochAdvanced event; replaces periodic-refresh task-generator │
│ │ cache and operator-set routing cache │
├─────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ 2 │ Extract gateway_authenticated_method! helper from verify_task_generator_signature_cached; apply to the 7 unguarded endpoints │
│ │ (simulate*, validateSecretsSchema, getPublicKey, getStateCommitProposal, signStateCommit) │
├─────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ 3 │ Rebuild newt_signedRead: drop user ECDSA + NonceTracker + InFlightTracker; replace with gateway task-gen signature; add │
│ │ API-key gate; new SignedReadRequest wire schema │
├─────┼──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ 4 │ Apply H1/H2/M2 timeout + caching fixes (gateway broadcast 800ms timeout, cached provider, calldata 500ms timeout with │
│ │ graceful degrade) + tighten OWNER_LOOKUP_TIMEOUT 5s→1s + cache getClientRecord results 60s TTL │
└─────┴──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

Aligned wire-schema target for SignedReadRequest:

pub struct SignedReadRequest {
pub chain_id: u64,
pub namespace: u8,
pub leaf_key: Bytes,
pub policy_client: Address,
pub timestamp: u64,
pub gateway_signature: Bytes, // EIP-712 by task generator
// (no nonce, no user signature)
}

SignedReadResponse keeps operator_sig (Ed25519) + gateway-overlaid commit_sig (BLS) unchanged.

  1. Cross-cutting alignment items
  • Trust boundary clarity: gateway = customer-tier authorization (API key, rate, billing); operator = protocol-soundness checks (task-gen
    sig, namespace decode, on-chain authz, JMT proof, Ed25519 sign). Two layers, two concerns.
  • Lessons.md entries to add post-implementation:
    • "Replay-protection caches must evict per-owner" — already added; pin operator-side reasoning
    • State-commit operator-majority disagreement is transient (3 flavors) — already added in PR #612 dissolution
    • State-commit registry reverts classify as poison — already in error-selectors.md
  • EigenDA framing correction: EigenDA replaces where do I get the encrypted bytes (storage/availability), not what state version do
    those bytes belong to (which JMT proof + operator_sig + on-chain commitStateRoot anchors). The two layers compose.

What I'd do next

The structural path is unambiguous: NEWT-1175 lands first because Phase 3 caching depends on EpochAdvanced. Three sign-off items remain
(item 1, 2, 3 in §6 above) before I can write the contract code. Once those settle, the sequence is:

  1. Write OperatorRegistry contract change + Foundry test file (NEWT-1175 / PR #615)
  2. Pass just check-storage-layouts gate
  3. Merge → write Rust epoch-cache wrapper + chain-watcher (PR sequence 1)
  4. Extract gateway_authenticated_method! + 7-endpoint application (PR sequence 2)
  5. Rebuild newt_signedRead (PR sequence 3)
  6. Timeout/cache fixes (PR sequence 4)

★ Insight ─────────────────────────────────────
Calling out the meta-pattern: the conversation moved from audit-finding (PR #613 had open issues) to trust-model (why does this code
exist?) to primitive choice (Ed25519 vs BLS) to contract precondition (epoch-aligned governance). That's the right direction — pulling
the question one layer up each time the answer wasn't fully satisfying. The drift to PR #615 isn't scope creep; it's discovering that
the cleanest version of the original change requires a structural primitive that doesn't exist yet.

Worth bookmarking for future similar refactors: when a "simplify" proposal feels right but the safety analysis keeps surfacing residual
risks, the right move is often to find the structural precondition that retires the risk class entirely, rather than negotiating the
residual. Here: epoch-bounded sets retire "stale cache vs. authorization drift" as a class.
─────────────────────────────────────────────────

Bottom line: PR #612 done; PR #613 shipped the response side of the trust-model alignment but left the request side untouched; PR #615 /
NEWT-1175 is now the structural precondition for finishing what #613 started. The Phase 1-4 sequence is the path from #615 merge to a
uniform, epoch-cached, gateway-authenticated operator RPC surface.

@denniswon

denniswon commented May 6, 2026

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Great corrections. Let me address each.

  1. Noted — Sepolia, not Holesky. Updating my mental model.

  2. Local fresh anvil pattern noted. Without looking at the Justfile yet, my mental shift is: not anvil --fork-url, but anvil clean + the
    existing E2E machinery deploys the contracts and seeds operators. The integration test re-uses that setup.

  3. This is the sharper question. Let me answer carefully because the framing matters.

ELIP-008 — what it actually is

You're right that ELIP-008 is fundamentally a cross-chain spec. Its title is something like "Multichain ECDSA/BLS Certificate
Verification" — it's the EigenLayer proposal that introduced the OperatorTableUpdater ↔ CertificateVerifier machinery for propagating
operator-set state across chains and verifying BLS/ECDSA certificates against confirmed roots.

The architecture pieces ELIP-008 introduced:

  • BN254OperatorTableUpdater (and ECDSA equivalent) — confirms operatorInfoTreeRoot on the destination chain
  • BN254CertificateVerifier — pairing-checks certificates against the confirmed root
  • The transporter — cross-chain pusher that calls confirmGlobalTableRoot

So ELIP-008 is "the spec for how a destination chain learns who's in the operator set on the source chain, and how it verifies BLS
aggregates produced by those operators."

Why state-commit uses ELIP-008 machinery

This is the crux of your question. State-commit is per-chain. On Sepolia, operators sign a state commit, the aggregator submits to
Sepolia's StateCommitRegistry. There's no inherent cross-chain anything happening at that moment.

So why is StateCommitRegistry.commitStateRoot() calling into BN254CertificateVerifier (an ELIP-008 contract)?

Newton's design decision: use one BLS verification primitive across the whole system. EigenLayer middleware ships exactly one
BLS-aggregate-verification contract — BN254CertificateVerifier — and it's shaped for ELIP-008 (full APK + non-signer witnesses). Newton
uses it for state-commit verification on every chain, source and destination, because:

┌──────────────────────────────────────────────────────────────┬────────────────────────────────────────────────────────────────────┐
│ Alternative │ Cost │
├──────────────────────────────────────────────────────────────┼────────────────────────────────────────────────────────────────────┤
│ Roll a same-chain BN254 verifier │ Custom unaudited cryptographic code; two different code paths to │
│ │ maintain (same-chain vs cross-chain) │
├──────────────────────────────────────────────────────────────┼────────────────────────────────────────────────────────────────────┤
│ Use only the per-chain verifier on source-chain state │ Same problem; plus inconsistent semantics between chains │
│ commits, ELIP-008 verifier on destination │ │
├──────────────────────────────────────────────────────────────┼────────────────────────────────────────────────────────────────────┤
│ Use ELIP-008 verifier everywhere │ Inherits witness-construction overhead but only one audited │
│ │ verification primitive │
└──────────────────────────────────────────────────────────────┴────────────────────────────────────────────────────────────────────┘

Newton picked option 3. The witness machinery is the cost of admission for using EigenLayer's audited BLS verifier — even when the
state-commit happens entirely on one chain, the verifier still wants its standard witness shape.

So the answer to "what does ELIP-008 have to do with state-commit?" is: nothing fundamentally. State-commit is per-chain BLS aggregate
verification. But because Newton uses the EigenLayer ELIP-008 verifier for that BLS aggregate verification, it inherits ELIP-008's
witness requirement.

Witness vs transporter — different things, same root

This is the cleanest way to see the separation:

┌────────────────┬────────────────────────────────────────────────────────────────┬─────────────────────────────────────────────────┐
│ │ Transporter │ Non-signer witness │
├────────────────┼────────────────────────────────────────────────────────────────┼─────────────────────────────────────────────────┤
│ What │ Pushes operatorInfoTreeRoot (one bytes32) to chain X │ Per-certificate proof that operator i's pubkey │
│ │ │ is at index i in that tree │
├────────────────┼────────────────────────────────────────────────────────────────┼─────────────────────────────────────────────────┤
│ When │ Periodically — once per operator-set epoch (e.g., when │ Per certificate, every state commit (every │
│ │ operator joins/leaves) │ 120s) │
├────────────────┼────────────────────────────────────────────────────────────────┼─────────────────────────────────────────────────┤
│ By whom │ Transporter binary, off-chain process driven by source-chain │ Aggregator, on each commit cycle │
│ │ events │ │
├────────────────┼────────────────────────────────────────────────────────────────┼─────────────────────────────────────────────────┤
│ Granularity │ The root is one bytes32 per (operator-set, timestamp) │ The witness is one struct per non-signer per │
│ │ │ certificate │
├────────────────┼────────────────────────────────────────────────────────────────┼─────────────────────────────────────────────────┤
│ Stored │ Yes — │ No — passed in calldata, used during │
│ on-chain │ _operatorSetInfos[key][refTimestamp].operatorInfoTreeRoot │ verification, not persisted │
├────────────────┼────────────────────────────────────────────────────────────────┼─────────────────────────────────────────────────┤
│ Failure mode │ │ Verifier rejects with VerificationFailed (math │
│ if absent │ Verifier rejects with ReferenceTimestampDoesNotExist │ doesn't balance) or treats non-signers as │
│ │ │ zero-pubkey (wrong APK subtraction) │
└────────────────┴────────────────────────────────────────────────────────────────┴─────────────────────────────────────────────────┘

They compose like this:

  1. Transporter establishes the root on-chain: "at referenceTimestamp = T, the operator-table is committed to root 0xabc...."
  2. Aggregator (per state commit) fetches the canonical operator list from the source-chain calculator, computes which operators didn't
    sign this commit, and produces witnesses proving each non-signer's pubkey is at its index in the same tree the transporter committed.
  3. On-chain verifier subtracts each witnessed non-signer's G1 pubkey from the full G1 APK to recover signers_apk_g1, then pairing-checks
    e(sigma, G2) == e(H(digest), signers_apk_g2).

So:

  • Without transporter: verifier doesn't have a root to check witnesses against → every state commit reverts
  • Without witnesses: verifier sees nonSignerWitnesses: [] → assumes 100% participation → if anyone didn't sign, the math doesn't balance
    and pairing fails

Even on a chain where transporter hasn't fired (e.g., a fresh anvil where no operator-set update has been confirmed), the witness
mechanism is still the protocol — the verifier insists.

Could Newton skip witnesses entirely?

Only by replacing BN254CertificateVerifier with a simpler same-chain BLS verifier that doesn't use the ELIP-008 protocol. That's a
deliberate divergence from EigenLayer middleware — possible, but:

  • New unaudited code in the slashing-critical path
  • Loss of cross-chain compatibility (state commits couldn't be verified by destination chains using the ELIP-008 verifier)
  • Different verification semantics between Newton and the rest of the EigenLayer ecosystem

The Phase 2 work was structured around using the ELIP-008 verifier as-is. Worth asking whether that's still the right call before the
integration test lands — if there's appetite to swap to a same-chain verifier, all the witness machinery becomes deletable.

Want me to look at the Justfile to map out the local-anvil E2E pattern for the integration test?

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