🔐 Key Features of Blockchain
1. Decentralization
No central authority. Every node has equal rights and stores the full ledger. Even if some nodes fail or are attacked, the system remains intact.

2. Immutability
Once data is recorded, it can’t be tampered with. Unless over 51% of the network agrees to change a record, any attempt to alter it is invalid.

3. Irreversibility
Transactions are permanent. Once confirmed (usually after 6 confirmations), they cannot be undone or deleted.

4. Anonymity
Users don’t need to reveal their identity. You can send crypto to a wallet without knowing who owns it, and even if a private key is stolen, the attacker’s identity remains unknown.