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Merge pull request #2036 from instagibbs/2025-11-bip54_sum_sigops

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bip54: clarify sigops counting, borrow bip16 language
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Mark "Murch" Erhardt 2025-11-17 10:45:55 -08:00 committed by GitHub
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@ -69,12 +69,14 @@ Given a block at height `N`:
A limit is set on the number of potentially executed signature operations in validating a
transaction. It applies to all transactions in the block except the coinbase transaction[^1]. For
each input in the transaction, count the number of `CHECKSIG` and `CHECKMULTISIG` in the input
scriptSig and previous output's scriptPubKey, including the P2SH redeemScript. The accounting is the
same as for [bip-0016][BIP16 specs]: a `CHECKSIG`/`CHECKSIGVERIFY` operation accounts for 1 and a
`CHECKMULTISIG`/`CHECKMULTISIGVERIFY` accounts for the number of public keys associated, or 20 if
the number of public keys is greater than 16. A `CHECKMULTISIG`/`CHECKMULTISIGVERIFY` not directly
preceded by a minimally-pushed number between 1 and 16 (included) accounts for 20. If the
total is strictly higher than 2500, the transaction is invalid.
scriptSig and previous output's scriptPubKey, including the P2SH redeemScript. If the total summed
over all transaction inputs is strictly higher than 2500, the transaction is invalid. The accounting is the
same as for [bip-0016][BIP16 specs], evaluating the scriptSig, scriptPubKey, and P2SH redeemScript
separately:
1. `CHECKSIG` and `CHECKSIGVERIFY` count as 1 signature operation, whether or not they are evaluated.
2. `CHECKMULTISIG` and `CHECKMULTISIGVERIFY` immediately preceded by `OP_1` through `OP_16` are counted as 1 to 16 signature operations, whether or not they are evaluated.
3. All other `CHECKMULTISIG` and `CHECKMULTISIGVERIFY` are counted as 20 signature operations, whether or not they are evaluated.
Transactions whose witness-stripped serialized size is exactly 64 bytes are invalid.