GenPrivKey generates a new ECDSA private key on curve secp256k1 private key.

GenPrivKeyFromSecret hashes the secret with SHA2, and uses that 32 byte output to create the private key.

PubKeySize is comprised of 32 bytes for one field element (the x-coordinate), plus one byte for the parity of the y-coordinate.

PrivKey defines a secp256k1 private key.

PubKey defines a secp256k1 public key Key is the compressed form of the pubkey.