Blockchain is immutable primarily because of the way it structures and secures data using cryptographic hashes and consensus mechanisms. Here's how it works

1. Cryptographic Hashing

i). Every block contains a hash of its own data and the hash of the previous block.

ii). If someone tries to alter the data in a block, its hash changes—breaking the link to the next block.

iii). This would require recalculating all subsequent hashes, which is computationally infeasible on a large scale.

2. Consensus Mechanisms

i). Networks use protocols like Proof of Work (PoW) or Proof of Stake (PoS) to agree on the state of the blockchain.

ii). To alter a block, an attacker would need to control a majority of the network’s power (e.g., 51% attack), which is extremely difficult and expensive.

3. Decentralization

I). A blockchain is maintained by many nodes (computers) across the world.

ii). Any attempt to change data must be accepted by a majority of nodes—adding another layer of resistance to tampering.

Together, these elements make blockchain tamper-resistant and secure, leading to what we call immutability.

That's all for now 😊

I hope you learn something new 

Good luck 🫶