I’m trying to better understand how blockchain technology maintains data integrity and immutability in a decentralized environment.

From what I understand, blockchain uses a distributed ledger where each block is linked to the previous one using cryptographic hashes. However, I’m confused about how this actually prevents data from being altered.

Specifically:

• If someone modifies data in a block, what exactly breaks in the chain?

• How do other nodes detect that a block has been tampered with?

• What role do consensus mechanisms (like Proof of Work or Proof of Stake) play in maintaining immutability?

• Is it theoretically possible to rewrite the blockchain if enough computing power is controlled?

I’m looking for a more technical explanation of how immutability is enforced across the network, not just a high-level overview.