11. What consensus algorithm does EOS use? a. POW

b. POS

8. Alice sends Bob 1 bitcoin. The blockchain ledger reads that most of that 1 bitcoin went to Bob, but a very small portion went to a third party. What does that small number represent? a. The block reward b. The fee to the miner for processing the transaction C. An error 9. A smart contract is an agreement between two people in the form of computer code or script. They run on the blockchain, so they are stored on a public database and cannot be changed. a. True b. False 10. What is the benefit of a smart contract over traditional software? a. It is decentralized, so less likely to be hacked/modified b. It is centralized, so it is less likely to be hacked/modified c. It is centralized, so it is more likely to be hacked/modified1. Which is not an element of a Nakamoto (Bitcoin) blockchain a. Digital signature b. Digital timestamp c. Digital alarm 2. In what circumstances does a blockchain make sense? a. When you have multiple, unknown users that can write/edit the database. b. When there is a single administrator that can write/edit the database. c. When no data needs to be stored. 3. Blockchain-based supply chain management can be defeated by a. Tampering with or moving the sensor (oracle) b. Hash rate difficulty c. Bribery 4. A cryptographic hash function is characterized by its extreme difficulty to revert, in other words, to recreate the input data from its hash value alone. a. True b. False 5. In bitcoin, "work" is: "transaction block" + ="hash" a. "proof of stake" : the reward for generating a block b. "nonce" : a special number found by trial and error that makes the equation true c. "verify" : signing a message digitally 6. A benefit of proof of stake is that it eliminates unproductive or wasted "work" a. True b. False 7. How many different hash combinations are there with SHA-256? a. 2562 b. 10256 C. 2256