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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​

Step 2 : Perform Sign​

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

Example​

Example.swift
    let MESSAGE_HASH = "cfa1ff5424d14eb60614d7ddf65a32243d26ddf7000d10007853d7336395efe4"

    func performSignature(keyshare: Data, duoSession: DuoSession) async -> Data?
    {
        let result = await duoSession.signature(
            keyshare: keyshare, message: MESSAGE_HASH,
            chainPath: "m"  // This is the default, use your desired path here. For e.g 'm/1/2'
        )
        // returns nil if operation fails or other flow you might have
        switch result {
        case .success(let dataBytes):
            do {
                // do something with bytes
                Swift.print(dataBytes)
                return dataBytes
            }
        case .failure(let error):
            do {
                // show error to user or abort process
                Swift.print(error)
                return nil
            }
        }
    }
  • keyshare is the client's "share" of the MPC wallet.
  • messageHash is the hash of the message to be signed as ByteArray.
  • duoSession.sign() performs message exchange between mobile and server to generate a ECDSA/EdDSA signature.
  • Result of duoSession.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.