# Functions
GenPrivKey generates a new ECDSA private key on curve secp256k1 private key.
GenPrivKeySecp256k1 hashes the secret with SHA2, and uses that 32 byte output to create the private key.
# Constants
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PubKeySecp256k1Size is comprised of 32 bytes for one field element (the x-coordinate), plus one byte for the parity of the y-coordinate.
# Type aliases
PrivKeySecp256k1 implements PrivKey.
PubKeySecp256k1 implements crypto.PubKey.