Hash Chain Simulator - Break the Blockchain

📋 Choose Your Scenario:

🏛️ Land Records

AP government land ownership blockchain. Try to commit fraud!

🏥 Medical Records

Patient medical history blockchain. Try to alter records!

📦 Supply Chain

Product tracking blockchain. Try to fake origin!

✏️ Custom Scenario

Create your own blockchain with your data!

🎯 YOUR CHALLENGE: Try to hack ANY block and see what happens to the chain!

💡 How to Play:
1. Click "Edit" on any block to change its data
2. Watch how the entire chain breaks automatically
3. See the network reject your tampered chain
4. Try to "mine" new blocks to fix the chain (see how hard it is!)
5. Click "Reset" to restore original blockchain

🎮 Controls

⚠️ TAMPERING DETECTED!
You changed a block! All subsequent blocks are now INVALID because their "previous hash" no longer matches.
The network has detected your fraud attempt.

🔨 Mining in Progress...
You're trying to recompute hashes for all broken blocks to hide your fraud.
But the honest network is adding new blocks faster than you can compute!

⛏️ Mining Simulation

Recomputing hashes for broken blocks... (10 seconds per block on Bitcoin network)

Block 0 of 0 recomputed...

🌐 Network Validation (1000 Computers)

Each computer independently verifies the blockchain:

🔒 Why Blockchain is Tamper-Proof:

1. Cryptographic Linking (SHA-256): Each block contains the hash of the previous block. Change one character in any block, and its hash completely changes, breaking all subsequent blocks.

2. Real-Time Validation: The network instantly detects mismatches. Your tampered version is rejected by 999 out of 1000 nodes.

3. Mining is Computationally Expensive: Even if you try to recompute all hashes to "fix" your chain, it takes ~10 minutes per block. Meanwhile, honest miners add 2-3 new blocks. You're always behind!

4. 51% Attack Requirement: To force your fraudulent chain, you'd need to control 501+ out of 1000 nodes. Cost: ₹500+ crores in infrastructure + coordination with hundreds of people.

🎯 This is why blockchain prevents corruption and fraud at scale.

⛓️ Break the Blockchain Challenge