Which of the following is true of SHA-256? (check all that apply)

Which of the following types of modifications of a block chain data structure can be
 detected by someone who holds a hash pointer to the latest block? (check all that apply)

Which of these keys are required for verifying a signature? (check all that apply)

If you generate numerous identities (public keys) for yourself and interact online using
 those different identities: (check all that apply)

Alice and Bob use ScroogeCoin. Alice owns ten coins, each under a different address (public key) and each of value 3.0. She would like to transfer coins of value 5.0 to Bob. Recall that the PayCoins transaction consumes (and destroys) some coins, and creates new coins of the same total value. Alice’s transfer will require, at a minimum: (check all that apply)