medium
Single Answer
0What two key features define blockchain ledgers?
Answer Options
A
They are immutable and nontransferable.
B
They are shared and can be modified by a vote among all participants.
C
They are unique to each participant and are atomic.
D
They are shared and immutable.
Correct Answer: D
Explanation
Blockchain ledgers are immutable—they cannot be changed after they are recorded, and they are shared, which means that each participant in the blockchain has access to the entire ledger. Transactions are recorded only once and cannot be tampered with—in fact, if an error is made and recorded, a new record has to be created including the fix, and both records will be accessible to show the history of what occurred.