libsecp256k1 is the cryptographic library that secures every Bitcoin transaction and
@blksresearch is one of its key contributors and maintainers.
They also maintain libsecp256k1-zkp, the extended fork that powers
@Liquid_BTC's Confidential Transactions, MuSig2, and zero-knowledge proofs.
The team has just brought the zkp fork up to date with 2.5 years of upstream improvements.