respond: signer=mpch-01.testnet, request=SignatureRequest { tweak: Tweak([219, 168, 68, 128, 219, 92, 120, 51, 228, 10, 113, 57, 202, 242, 53, 98, 58, 18, 212, 95, 163, 11, 30, 1, 27, 145, 164, 100, 243, 254, 131, 159]), payload: Ecdsa(BoundedVec { inner: [125, 215, 201, 191, 151, 191, 47, 76, 218, 67, 129, 65, 174, 213, 177, 229, 220, 223, 199, 211, 171, 35, 221, 54, 216, 81, 194, 231, 169, 216, 38, 138], witness: NonEmpty(()) }), domain_id: DomainId(0) }