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.
block data require passwords that are called hashes.
hashes are impossible to guess.

Explanation:

In blockchain, a hash is a cryptographic function that takes an input (like data in a block) and produces a fixed - length string of characters (the hash value). Each block's hash is based on its own data and the hash of the previous block. This creates a chain where each block is linked to the previous one. If any data in a block is changed, its hash will change, and since the next block's hash depends on the previous one, the entire chain would be affected. Hashing in this context is more about creating a unique identifier (like a fingerprint) for each block rather than blocking all changes (as new blocks can be added) or being a password. Also, it's not about alerting the government.

Answer:

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