sign
abstract fun signHashSchnorrWithNonce(hash32: ByteArray, secret32: ByteArray, nonce32: ByteArray): ByteArray
abstract fun signHashSchnorrWithNonce(hash32: UByteArray, secret32: UByteArray, nonce32: UByteArray): UByteArray
Sign the passed 32 byte cryptographic hash of some data using secp256k1 EC Schnorr, using the passed private nonce. Note, it is INSECURE to pass unhashed data to this function!!!