Which of the following statements is true regarding blockchain technology?

The correctness of the answer can be attributed to the fact that each of the statements presented accurately describes key aspects of blockchain technology and its operation.

The process of adding blocks to a blockchain involves solving complex mathematical problems, which requires significant computational resources. This aligns with the first statement, highlighting that each subsequent block becomes progressively more difficult to modify as the blockchain grows. This is a fundamental security feature of blockchain, ensuring the integrity and immutability of the transaction history.

The second statement relates to the concept of "Proof of Work," which is a consensus mechanism used in many blockchain networks, including Bitcoin. Miners must solve computational puzzles to validate transactions and create new blocks. This process is essential for maintaining the decentralized nature of the blockchain, as it ensures that the network reaches consensus without the need for a central authority.

The third statement accurately describes how miners create the Proof of Work. In order to successfully add a new block, the miner must find a hash that meets specific criteria, such as starting with a predetermined number of leading zeros. This requirement makes it increasingly difficult to alter previous blocks and thus reinforces the security of the blockchain.

Given that all these statements correctly reflect the underlying principles and mechanics of blockchain technology, the answer encompassing all of them is true.