Block signatures refer to a method used to verify the authenticity and integrity of blocks in a blockchain. Each block, which contains a collection of transactions, can be signed using a cryptographic signature. This signature is generated using the private key of the block’s creator.

When a block is signed, it assures that the data within the block has not been altered. Other participants in the network can verify the signature using the corresponding public key. If the verification is successful, it assures them that the block is valid and has been created by its claimed originator. Block signatures enhance security and trust within the network.

They help prevent issues such as double-spending and ensure that only authorized parties can add blocks to the blockchain. This becomes especially important as the network grows and transactions increase, making it crucial to maintain a reliable and tamper-proof ledger. In summary, block signatures serve as a foundational security mechanism that validates the legitimacy of transactions and the creators of those blocks, fostering confidence among users.