Certified Blockchain Solutions Architect (CBSA) — Question 25

On the Ethereum blockchain the "nonce" of a transaction:

Answer options

• A. Holds the gas amount to be paid to the miner writing the block that contains the transaction
• B. Is used to ensure that transactions by a given account are written in sequential order
• C. Is reset to zero after each successfully mined blocked
• D. Must always start with four zeroes

Correct answer: B

Explanation

The correct answer is B because the nonce is a counter that ensures transactions from the same account are processed in the order they were created. Option A is incorrect as the gas amount is separate from the nonce, while C is false because the nonce does not reset after mining a block. D is also incorrect since the nonce does not have any requirement regarding leading zeroes.