We learned in chapter 4 that private keys are huge random numbers kept secret by whomever generated them. We can use Elliptic Curve math to derive a public key from that private key.

The public key can be shared as a unique identifier and the private key is used to prove a person has control of that identifier. That proof is called a SIGNATURE. To create a signature you need a message and a private key. Anyone can verify the signature with a copy of the message and the corresponding public key.

Vanderpoole has provided a signature and a message. Where is the public key?