BC6

Which of the following forms the fundamental data structure behind blockchain?

• hash chain

• genesis block

• couchdb

• all of the above

• A

• B

• C

• D

An advantage of Merkle tree over a hash chain is:

• Easier to identify fork

• Easier to do linear search

• Easier to identify tampering

• Easier to generate the hash

• block 1

• block 2

• block 3

• none

What is a disadvantage of Proof of Elapsed Time consensus?

• Slow to confirm transaction

• Validators are known

• Requires processor extensions

• High energy usage