Block sizes

deneb sizes - block_attestation.txt

SignedBeaconBlock: 1125899911395480
  message: 1125899911395380
    slot: 8
    proposer_index: 8
    parent_root: 32
    state_root: 32
    body: 1125899911395296
      randao_reveal: 96
      eth1_data: 72
      graffiti: 32
      proposer_slashings: 6656
      attester_slashings: 66472
      attestations: 62592
      deposits: 19840
      voluntary_exits: 1792
      sync_aggregate: 160
      execution_payload: 1125899911038192
        parent_hash: 32
        fee_recipient: 20
        state_root: 32
        receipts_root: 32
        logs_bloom: 256
        prev_randao: 32
        block_number: 8
        gas_limit: 8
        gas_used: 8
        timestamp: 8
        extra_data: 32
        base_fee_per_gas: 32
        block_hash: 32
        transactions: 1125899911036928
        withdrawals: 704
        blob_gas_used: 8
        excess_blob_gas: 8
      bls_to_execution_changes: 2752
      blob_kzg_commitments: 196608
  signature: 96
  root: 32
Attestation: 485
  aggregation_bits: 257
  data: 128
  signature: 96

ssz_sizes.nim

import
  std/typetraits,
  ../beacon_chain/spec/eth2_ssz_serialization,
  ../beacon_chain/spec/datatypes/[deneb]

proc maxSize(T: type): int =
  when isFixedSize(T):
    fixedPortionSize(T)
  elif T is HashList:
    maxSize(T.T)
  elif T is BitList:
    (T.maxLen div 8) + 1
  elif T is BitArray:
    (T.maxLen + 7) div 8
  elif T is List:
    type E = T.T
    when isFixedSize(E):
      T.maxLen * maxSize(E)
    else:
      T.maxLen * (maxSize(E) + 4)

  elif T is object|tuple:
    var size = fixedPortionSize(T)
    for field in fields(default(T)):
      when not isFixedSize(typeof(field)):
        size += maxSize(typeof(field))
    size
  else:
    0

proc printSizes(T: type, indent: string) =
  when T is object:
    for name, field in fieldPairs(default(T)):
      type F = typeof(field)
      echo indent, name, ": ", maxSize(F)

      when not isFixedSize(F):
        printSizes(F, indent & "  ")

proc printSizes(T: type) =
  echo T.name, ": ", maxSize(T)
  printSizes(T, "  ")

printSizes(deneb.SignedBeaconBlock)
printSizes(Attestation)