Signing and Verifying

final keyring = Keyring();
final keyPair2 = KeyPair.sr25519.fromSeed(Uint8List.fromList(hex.decode(
    '9d61b19deffd5a60ba844af492ec2cc44449c5697b326919703bac031cae7f60'));

keyring.add(keyPair2);

final kp = keyring.getByPublicKey(keyPair2.publicKey.bytes);

final signature = kp.sign(message);

final isVerified = kp.verify(message, signature);