I spent the last few days implementing BIP 360 (P2MR) inside Bitcoin Core as a learning exercise, and ended up with results that seem worth sharing: all official construction vectors passing, two bugs found in the PQC vector file, some measured witness sizes, and a few places where the spec text could be tighter.

To be clear up front: this is an independent, educational implementation on regtest only. I’m not affiliated with the BIP authors and I’m not proposing anything about activation. The spec version is pinned to v0.12.x, bitcoin/bips commit 

bitcoin

> *by* [**jeanpablojp**](https://delvingbitcoin.org/u/jeanpablojp)
>
> I spent the last few days implementing BIP 360 (P2MR) inside Bitcoin Core as a learning exercise, and ended up with results that seem worth sharing: all official construction vectors passing, two bugs found in the PQC vector file, some measured witness sizes, and a few places where the spec text could be tighter.
>
> To be clear up front: this is an independent, educational implementation on regtest only. I’m not affiliated with the BIP authors and I’m not proposing anything about activation. The spec version is pinned to v0.12.x, bitcoin/bips commit [0fdf6ff](https://github.com/bitcoin/bips/commit/0fdf6ffdbb394a73c80978ae647322ceda8b9337) (2026-07-24).
>
> * Code: [jeanpablojp/bitcoin, branch `p2mr-regtest`](https://github.com/jeanpablojp/bitcoin/tree/p2mr-regtest)
> * Notes and findings: [jeanpablojp/bitcoin-p2mr](https://github.com/jeanpablojp/bitcoin-p2mr)
> #
> [**...read more at delvingbitcoin.org**](https://delvingbitcoin.org/t/bip-360-p2mr-implemented-in-bitcoin-core-on-regtest-vector-results-measurements-spec-feedback/2751)