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bip-341: Commit to all scriptPubKeys in SigMsg #920

Merged
merged 2 commits into from
Jun 1, 2020
Merged

bip-341: Commit to all scriptPubKeys in SigMsg #920

merged 2 commits into from
Jun 1, 2020

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jonasnick
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@gmaxwell
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Is there a discussion as to why amounts and scriptpubkey are separately hashed instead of just being one hash interleaved with the amounts? (more similar to the anyonecan pay case)

@jonasnick
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Yes, the current design was suggested by @roconnor on the mailing list (https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2020-May/017808.html) because it saves signers from receiving and hashing the scriptPubKeys if they're just interested in the amounts.

@gmaxwell
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I can't figure out what use a signer would have for the scriptpubkeys without the values. Values without scriptpubkeys would be useful if the signer is always going to assume all inputs are its own.

@jonasnick
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Yeah, scriptPubKeys but not values seems useless. But since values without scriptPubKeys are useful, hashing them separately is better than having a single hash for all TxOuts. Or am I misunderstanding your suggestion?

@gmaxwell
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Hm. On the basis that scripts without amounts are likely not useful the commitment to scriptpubkeys could be inside the commitment to the amounts, which I think would save some hashing in verifiers and reduce data needing to be sent to signers that don't care about either, but I suppose it doesn't matter much.

@sipa
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sipa commented May 23, 2020

ACK, also included in bitcoin/bitcoin#17977 now.

@ajtowns
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ajtowns commented May 25, 2020

ACK

2 similar comments
@gmaxwell
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ACK

@prusnak
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prusnak commented Jun 1, 2020

ACK

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