sign
Signs a message hash with two-party threshold signing.
Both parties jointly produce a standard signature under the key addressed by keyId, optionally under a BIP32 child key.
Return
the signature bytes.
Parameters
keyId
the hex-encoded keyId to sign with; the SDK reads the share from its StorageClient.
message
the message hash to sign, hex-encoded. Pass a cryptographic digest (e.g. SHA-256, Keccak-256), not raw data.
derivationPath
BIP32 path of the signing key; defaults to "m", the root key (e.g. "m/44'/60'/0'/0/0").