Batch Validation

Date

21 October, 2025

Topics

Bitcoin Core Batch Validation

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Batch Verification was already specified in BIP340 (Schnorr): https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki#batch-verification
There is a PR open on libsecp256k1 that adds a new module: https://github.com/bitcoin-core/secp256k1/pull/1134
The PR has gone through a few iterations already, but needs more review
A few more comments have come in recently, hopefully the PR review can pick up momentum
Pippenger support not added yet
Interface still likely to change somewhat
Draft PR in Core has went through some iterations as well: https://github.com/bitcoin/bitcoin/pull/29491
Block validation performance now close to what would be expected (without Pippenger)
Old benchmarks and graphics in the PR were confusing to people, there should be full benchmarks and new graphics added to make clear what the latest state is
PR currently not rebased frequently due to anticipated changes to the secp implementation
Discussion if we need to have a special way to deploy this (ability to turn the feature off, build without it etc.)
If some combination of signatures show up that verify correctly together but not individually then this would fork the chain
We should either be confident that this is secure and make it the default or we should not do it at all, so likely no special way to deploy it
Changes to checkqueue are not ideal yet, potential for refactoring checkqueue first
Discussion about lock freedom that keeps coming up, likely limited minor performance upside from this though, prior attempts failed because of this
Potential focus on simplifying the code without much performance impact, that could be a win as well
On Core PR: Open to review and approach feedback to changes in checkqueue, scriptcache and validation
Wrapper object on secp functions (BatchVerifier) should make impact on the rest of the changes small if secp interface changes

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Batch Validation

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