MuSig is a protocol for aggregating public keys and signatures for the schnorr digital signature algorithm.

MuSig allows multiple users each with their own private key to create a combined public key that’s indistinguishable from any other schnorr pubkey, including being the same size as a single-user pubkey. It further describes how the users who created the pubkey can work together to securely create a signature corresponding to the pubkey. Like the pubkey, the signature is indistinguishable from any other schnorr signature.

Compared to traditional script-based multisig, MuSig uses less block space and is more private, but it may also require more interactivity between the participants.

Primary code and documentation

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