MuSig2 is a two-round Schnorr multisignature protocol that aggregates several public keys and partial signatures into one BIP340-compatible signature.
Key coefficients defend against rogue-key attacks during aggregation. [BIP 327 — MuSig2 for BIP340-compatible Multi-Signatures] [Bitcoin Optech — MuSig]
Secret nonces must never be reused; reuse can expose a signer's private key. [BIP 327 — MuSig2 for BIP340-compatible Multi-Signatures] [MuSig2 paper]
On chain the cooperative result can look like one ordinary Taproot key-path spend, but coordination and backup paths remain application responsibilities. [Bitcoin Optech — MuSig] [MuSig2 paper]
Key coefficients defend against rogue-key attacks during aggregation. [MuSig2 paper] [Bitcoin Core — secp256k1 library]
Secret nonces must never be reused; reuse can expose a signer's private key. [BIP 327 — MuSig2 for BIP340-compatible Multi-Signatures] [BIP 340 — Schnorr Signatures]
On chain the cooperative result can look like one ordinary Taproot key-path spend, but coordination and backup paths remain application responsibilities. [Bitcoin Core — secp256k1 library] [BIP 340 — Schnorr Signatures]
Key coefficients defend against rogue-key attacks during aggregation. [MuSig2 paper] [BIP 341 — Taproot]
Secret nonces must never be reused; reuse can expose a signer's private key. [Bitcoin Optech — MuSig] [Bitcoin Core — secp256k1 library]
On chain the cooperative result can look like one ordinary Taproot key-path spend, but coordination and backup paths remain application responsibilities. [BIP 327 — MuSig2 for BIP340-compatible Multi-Signatures] [BIP 341 — Taproot]
Key coefficients defend against rogue-key attacks during aggregation. [BIP 340 — Schnorr Signatures] [BIP 341 — Taproot]
For the clearest picture, read this entry together with Schnorr signature, Taproot, Multisig, PSBT. The reverse links also lead from Schnorr signature, Submarine Swap, FROST, Andrew Poelstra.