Sign

This distributed signing process allows for secure transaction authorization while preserving the key's distributed nature, exemplifying the MPC wallet's enhanced security model.

Step 1 : Create Session

---

• Create TrioSession if you haven't already.

Step 2 : Perform Sign

---

• Call trioSession.sign() which returns Result of Success with Signature bytes as Data or Failure with error.

Example

---

Example.swift

    let MESSAGE_HASH = "53c48e76b32d4fb862249a81f0fc95da2d3b16bf53771cc03fd512ef5d4e6ed9"

    // Sign the message hash with the key addressed by keyId (from keygen/import).
    func performSignature(keyId: String, trioSession: TrioSession) async -> Data? {
        let result = await trioSession.sign(
            keyId: keyId, message: MESSAGE_HASH,
            derivationPath: "m"  // This is the default; use your desired path, e.g. "m/1/2"
        )
        // returns nil if the operation fails, or handle it however your flow needs
        switch result {
        case .success(let signatureBytes):
            // do something with the signature bytes
            Swift.print(signatureBytes)
            return signatureBytes
        case .failure(let error):
            // show the error to the user or abort the process
            Swift.print(error)
            return nil
        }
    }

• keyId identifies the client's key (from keygen/import); the SDK loads the keyshare from your StorageClient using it.
• messageHash is the hash of the message to be signed as a hex String.
• trioSession.sign() performs message exchange between mobile and server to generate a ECDSA/EdDSA signature.
• Result of trioSession.sign() could be a Success with Data (ECDSA/EdDSA signature) of messageHash, corresponding to the public key (or address) of the wallet or Failure with error.