KeyringPairFromSecret creates KeyPair based on seed/phrase and network Leave network empty for default behavior.

// LoadKeyringPairFromEnv looks up whether the env variable TEST_PRIV_KEY is set and is not empty and tries to use its // content as a private phrase, seed or URI to derive a key ring pair.

Sign signs data with the private key under the given derivation path, returning the signature.

Verify verifies data using the provided signature and the key under the derivation path.