ECDSA secp256k1: 32-byte private key, 33-byte public key
ECDSA accepts the message and rejects a changed one: passed
Public key parsed from bytes verifies: passed
Schnorr secp256k1: 32-byte public key, 64-byte signature: passed
Signers ECDSA_SECP256k1: passed
Signers ECDSA_SECP384R1: passed
Signers SCHNORR_SECP256k1: passed
ItemSigner accepts the object and rejects a changed one: passed
