What does a hash pointer allow you to verify in a Blockchain?

A hash pointer is a crucial component in the structure of a blockchain, as it uniquely combines a cryptographic hash of the data contained in a block with a reference to the preceding block. By doing this, it not only stores the current block's data securely but also ensures the integrity of the entire chain of blocks leading up to the current one.

When you have a hash pointer linking to the previous block, any alteration to the data in that previous block will change its hash value. Consequently, this would break the connection established by the hash pointer in the subsequent block, indicating that tampering has occurred. Thus, verifying the hash pointer allows you to assess that the previous block of data has remained unchanged, reinforcing the overall security and reliability of the blockchain.

The other options relate to different aspects of blockchain technology. While encryption is vital for secure transactions, the hash pointer specifically addresses integrity rather than encryption. Similarly, anonymity in transactions is provided through different mechanisms, such as pseudonymous addresses, not directly through hash pointers. Finally, network security encompasses a broader range of factors beyond just the verification of individual blocks and is not exclusively tied to the function of hash pointers.