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fe92c15f0cscript/sign: avoid duplicated signature verification after signing (Sebastian Falbesoner)080089567cbench: add benchmark for `SignTransaction` (Sebastian Falbesoner) Pull request description: This PR is a small performance improvement on the `SignTransaction` function, which is used mostly by the wallet (obviously) and the `signrawtransactionwithkey` RPC. The lower-level function `ProduceSignature` already calls `VerifyScript` internally as last step in order to check whether the signature data is complete:daa56f7f66/src/script/sign.cpp (L568-L570)If and only if that is the case, the `complete` field of the `SignatureData` is set to `true` accordingly and there is no need then to verify the script after again, as we already know that it would succeed. This leads to a rough ~20% speed-up for `SignTransaction` for single-input ECDSA or Taproot transactions, according to the newly introduced `SignTransaction{ECDSA,Taproot}` benchmarks: ``` $ ./src/bench/bench_bitcoin --filter=SignTransaction.* ``` without commit 18185f4f578b8795fdaa75926630a691e9c8d0d4: | ns/op | op/s | err% | total | benchmark |--------------------:|--------------------:|--------:|----------:|:---------- | 185,597.79 | 5,388.00 | 1.6% | 0.22 | `SignTransactionECDSA` | 141,323.95 | 7,075.94 | 2.1% | 0.17 | `SignTransactionSchnorr` with commit 18185f4f578b8795fdaa75926630a691e9c8d0d4: | ns/op | op/s | err% | total | benchmark |--------------------:|--------------------:|--------:|----------:|:---------- | 149,757.86 | 6,677.45 | 1.4% | 0.18 | `SignTransactionECDSA` | 108,284.40 | 9,234.94 | 2.0% | 0.13 | `SignTransactionSchnorr` Note that there are already signing benchmarks in the secp256k1 library, but `SignTransaction` does much more than just the cryptographical parts, i.e.: * calculate the unsigned tx's `PrecomputedTransactionData` if necessary * apply Solver on the prevout scriptPubKey, fetch the relevant keys from the signing provider * perform the actual signing operation (for ECDSA signatures, that could be more than once due to low-R grinding) * verify if the signatures are correct by calling `VerifyScript` (more than once currently, which is fixed by this PR) so it probably makes sense to also have benchmarks from that higher-level application perspective. ACKs for top commit: achow101: ACKfe92c15f0cfurszy: utACKfe92c15f0cglozow: light review ACKfe92c15f0cTree-SHA512: b7225ff9e8a640ca5222dea5b2a463a0f9b9de704e4330b5b9a7bce2d63a1f4620575c474a8186f4708d7d9534eab55d000393d99db79c0cfc046b35f0a4a778