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Last active October 5, 2016 13:25
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Hashed Timelock Contract (HTLC) as proposed in lightning.network paper
Raw
Original version
OP_DEPTH 3 OP_EQUAL
OP_IF
OP_HASH160 <hash160(R)> OP_EQUALVERIFY
OP_0 2 <AlicePubkey1> <BobPubkey1> 2 OP_CHECKMULTISIG
OP_ELSE
OP_0 2 <AlicePubkey2> <BobPubkey2> 2 OP_CHECKMULTISIG
OP_END
Raw
Proposed equivalent alternative
OP_IF
OP_HASH160 <hash160(R)> OP_EQUALVERIFY
OP_0 2 <AlicePubkey1> <BobPubkey1>
OP_ELSE
OP_0 2 <AlicePubkey2> <BobPubkey2>
OP_END
2 OP_CHECKMULTISIG
@maraoz
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maraoz commented Jul 9, 2015

  • OP_DEPTH 3 OP_EQUAL is not needed as party spending the script can include a 0 or 1 in the scriptSig to choose to enter through if or else branch.
  • 2 OP_CHECKMULTISIG was factored out of the OP_IF

@btcdrak
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btcdrak commented Jul 9, 2015

See http://lists.linuxfoundation.org/pipermail/lightning-dev/2015-July/000021.html

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