Question

question 4 of 10
how does a hash help secure blockchain technology?

• hashes do not allow any new blocks to be formed on a chain or new data to be added. hashes block all changes.
• hashes are like fingerprints that make each block of data unique. blocks form a chain that can only have new blocks added.
• hashtags allow others to see if someone is trying to change something and it alerts the government to prevent the changes.
• blocks of data require passwords that are called hashes. hashes are impossible to guess.

Explanation:

• First option: Incorrect. Hashes don't block all changes; new blocks can be added in blockchain.
• Second option: Correct. Hashes act as unique fingerprints for each block, and the blockchain is a chain where new blocks are added (not changes to existing blocks easily, as that would alter hashes).
• Third option: Incorrect. "Hashtags" are not related to blockchain hashing, and there's no government alert mechanism here.
• Fourth option: Incorrect. Hashes are not passwords for blocks; they are cryptographic hashes to ensure data integrity, not for authentication like passwords.

Answer:

B. Hashes are like fingerprints that make each block of data unique. Blocks form a chain that can only have new blocks added.