Hello all, BIP174 currently specifies that non-witness UTXOs (the transactions being spent by non-witness inputs) should be serialized in network format.
I believe there are two issues with this. 1. Even in case the transaction whose output being spent itself has a witness, this witness is immaterial to PSBT. It's only there to be able to verify the txid commits to the output/amount being spent, which can be done without witness. 2. "Network format" is a bit ambiguous. We can imagine a future softfork that introduces a new type of witness. Network format could be interpreted as including that new witness type, which is clearly unnecessary (by the above argument), and would gratuitously break compatibility with existing signers if implemented pedantically. So my suggestion is to update the specification to state that non-witness UTXOs must be serialized without witness. If it's too late for that, it should instead be updated to explicitly specify with or witnout witness, but it's safe to drop the witness. Opinions? Cheers, -- Pieter _______________________________________________ bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
