Blockchain Builder

Build, mine, and tamper with a blockchain to understand chain integrity

Difficulty 2 leading zeros

What is blockchain? A blockchain is a chain of blocks where each block contains transactions and a cryptographic hash linking it to the previous block. This creates an immutable ledger.

Try this: Add transactions, mine blocks, then click on any mined block to edit it and watch how tampering breaks the entire chain!

1 Add transactions below
2 Click "Mine Block" to add to chain
3 Click any block to tamper with it
4 See how tampering breaks the chain
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Chain Integrity Compromised!

One or more blocks have been tampered with. Re-mine affected blocks to restore integrity.

⛓ Blockchain
✓ Chain Valid
💳

Add Transaction

Mining in progress...
Trying nonce: 0