Structure

P256K.MuSig.PublicKey

secp256k1 MuSig2 aggregate public key produced by aggregate(_:) via secp256k1_musig_pubkey_agg, used for partial signature verification and Taproot tweaking.

iOS 13.0+
macCatalyst 13.0+
macOS 10.15+
tvOS 13.0+
visionOS 1.0+
watchOS 6.0+

struct PublicKey

Mentioned In

MuSig2 Multi-Signatures

Overview

An aggregate public key is indistinguishable from a single-signer secp256k1 public key by any external observer, which is precisely what gives MuSig2 its Taproot compatibility. Internally the key carries the 197-byte secp256k1_musig_keyagg_cache produced by secp256k1_musig_pubkey_agg; that cache is required to reconstruct the key-aggregation coefficients during the partial-signing phase and must be preserved alongside the public-key bytes when serializing the aggregate across a process boundary.

Topics

Serialized Forms

Reconstruction

Instance Methods

func add([UInt8], format: P256K.Format) throws -> P256K.MuSig.PublicKey
Creates a new P256K.MuSig.PublicKey by computing agg_pk' = agg_pk + G × tweak via secp256k1_musig_pubkey_ec_tweak_add (declared in Vendor/secp256k1-zkp/include/secp256k1_musig.h), updating the key aggregation cache in-place.
func isValidSignature<D>(P256K.Schnorr.PartialSignature, publicKey: P256K.Schnorr.PublicKey, nonce: P256K.Schnorr.Nonce, for: D) -> Bool
Verifies one signer’s P256K.Schnorr.PartialSignature against this aggregate public key using secp256k1_musig_partial_sig_verify (declared in Vendor/secp256k1-zkp/include/secp256k1_musig.h).