How Blocks and Chains Work

The Structure of a Block

Every block contains: Data (transactions), Hash (unique fingerprint), and Previous Hash (links to the chain).

Altering any block changes its hash, breaking every block after it — making blockchains tamper-resistant.

Block #102\nData: Alice sends 1 BTC to Bob\nPrevious Hash: 0000abc123...\nCurrent Hash:  0000def456...