MuSig2 (BIP327) Quick refs : protocol.md, key-agg.md, attacks.md MuSig2 is the standard Schnorr key-aggregation protocol for Bitcoin. n parties hold separate private keys, jointly produce a single public key and a single signature indistinguishable from a single-key Schnorr signature. Replaces MuSig1 (3-round) and MuSig-DN with simpler 2-round + better security proofs. Properties - Indistinguishable — observers cannot tell was aggregated. - Off-chain coordination — n-of-n in 2 rounds with no on-chain multisig. - Provably secure in the Algorithmic One-More-Discrete-Log (AOMDL) + Random Oracle…