As discussed in #696, this library currently does not provide the functionality to aggregate serialized nonces / parial signatures, which is useful if not all the signing happens within the same Swift app (i.e. a collaborative signing ceremony), such as in Boltz claims (or refunds).

I did an attempt of achieving this https://github.com/RubenWaterman/swift-secp256k1/pull/1/files but not sure it's the right way.