Re: [bitcoindev] [BIP Proposal] Informational BIP on Low-R Signature Grinding

[Murch <murch@murch.one>]

Hi Sean,

Thanks for proposing this idea. It would be splendid if someone were to 
write up the best practices for low-r signature grinding. You don’t need 
to worry about test vectors too much in advance, they are only required 
for advancing a BIP to the Complete status, so if people have more 
suggestions, those could also added to the document after the PR is open 
or even after it has been published in Draft.

Cheers,
Murch

On 2026-06-09 00:02, Sean Gilligan wrote:
> Hi Everyone,
>
> I would like to propose a new informational BIP to formally document 
> the Low-R signature algorithm used by Bitcoin Core and many other 
> wallets.
>
> It was implemented in 2018 in Bitcoin Core by PR 1366 [0]. The Low-r 
> grinding page on Bitcoin Optech [1] references several other 
> implementations.
>
> While working on secp256k1-jdk [2] (a new wrapper for secp256k1 for 
> Java/JDK/JVM-languages) we ended up looking at the C++ implementation 
> for reference and at rust-secp256k1 for a test vector. Since all 
> wallets should implement the algorithm identically (for privacy 
> reasons) it would be helpful to have the behavior clearly documented 
> in an informational BIP.
>
> I have spoken with a handful of developers who think having a BIP 
> would be a good idea and it was suggested on PR 13666.
>
> It should be short and relatively simple and also have a nice 
> collection of test vectors.
>
> What do people think? Any suggestions on what should be included or 
> pointers to test vectors?
>
> Thanks,
>
> Sean
>
> [0] https://github.com/bitcoin/bitcoin/pull/13666
> [1] https://bitcoinops.org/en/topics/low-r-grinding/
> [2] https://github.com/bitcoinj/secp256k1-jdk
>

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