⛓️ Explorer lab
Chain-in-a-Box
Five blocks, each sealed with the hash of the one before. Mine them, then try to secretly edit history — and watch three independent peers vote you down.
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The analogy
A notebook where every page carries a wax seal made from the page before it.
🌐 The network: 3 peers hold copies
Your chain above is Peer A. Peers B and C keep the honest copy. Consensus picks the version the majority agrees on.
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🧠 What this lab teaches
- Each block stores the previous block's hash.
- Editing any block invalidates every block after it.
- Re-mining a long chain is expensive; other peers still disagree.
- Security comes from cost + replication.
🔒 This simulator runs entirely in your browser with fictional data. Never type a real seed phrase or private key into any website.