1. ___________________ensures that the shared ledgers are exact copies, and lowers the risk of fraudulent transactions, because tampering would have to occur across many places at exactly the same time.
A. Replication
B. Consensus
C. Validation
D. Encryption
2. What kind of blockchain is it if each participant can create a new block?
A. Asymmetric Blockchain
B. Symmetric blockchain
C. Private Blockchain
D. Public Blockchain
3. Which of the following cryptocurrencies use an alternate consensus method called "Scrypt" to BTC's Proof of Work (POW) SHA-256 algorithm?
A. Steemit
B. Peercoin
C. Litecoin
D. Ripple
4. You are using Geth and you would like to list the accounts controlled by the node. What is the command?
