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🧪 Advanced Technology Blockchain Simulation

Watch a blockchain grow in 3D: each block mines a nonce until its hash clears the difficulty target, links to its parent by hash, and the whole chain lights up red the instant a past block is tampered with.

Cryptography2DModerate60 FPS

How It Works

This simulation renders a blockchain as a literal 3D chain: each cube is a block, and the thin bar connecting one cube to the next represents a cryptographic link — the parent block's hash embedded inside the child block's own data. The scene mines continuously (or one block at a time, if you switch off auto-mine), and the camera glides to keep the newest block in frame while still letting you orbit and zoom freely.

Mining. The "next" block pulses with a translucent outline while the simulation tries random nonces at the rate set by the mining-power slider. For each nonce it computes a toy hash of index + previous hash + nonce; the moment that hash starts with enough zero hex digits (the difficulty target) the block locks in gold, its hash prints above it, and a new block starts mining on top of it.
Difficulty. Each extra required leading zero multiplies the average number of nonces needed by 16, exactly mirroring how Bitcoin's difficulty target scales — this is why real proof-of-work is computationally expensive but a solved block is instantly checkable by anyone.
Tamper detection. Clicking "Tamper with a past block" silently edits one confirmed block's data. Its hash no longer matches what it originally mined, and because every later block stored a copy of that (now-wrong) hash as part of its own input, the entire chain from that point forward turns red — a visual proof that rewriting history means re-mining every block after the tampered one.

Toggle auto-mine off and click "Mine one block" to step through the search for a valid nonce yourself, or push the difficulty slider to 4 to feel how quickly proof-of-work work scales with each extra required zero.

Frequently Asked Questions

Why does linking blocks by hash make the chain tamper-evident?

Each block stores the hash of the block before it as part of its own data. Changing anything in a past block — even one character — produces a completely different hash for that block (the avalanche effect), which no longer matches the copy stored in the next block. That mismatch cascades forward through every subsequent block, so a single edit invalidates the whole tail of the chain.

What exactly is a "nonce" and why search for one at random?

A nonce is an arbitrary number a miner is free to change. Because a good hash function scrambles its output unpredictably, there is no shortcut to finding a nonce whose hash meets the difficulty target — miners must simply try nonces one after another until one works, which is what makes proof-of-work provably expensive to fake.

Why does higher difficulty slow mining down so much?

Requiring one more leading zero hex digit divides the fraction of valid hashes by 16, so the expected number of attempts needed multiplies by 16 too. This exponential relationship is exactly how real networks like Bitcoin retarget difficulty to keep block times roughly constant as total network hash power rises or falls.

Is the hash function used here real cryptography?

No — it's a small, fast, deterministic scrambling function (a toy hash) chosen so the simulation can mine hundreds of blocks per second in a browser tab. It has the same qualitative property that matters here — small input changes produce unpredictable output changes — but it is not collision-resistant or secure the way SHA-256 is, and should not be used for anything beyond this demonstration.

Why does the camera keep moving instead of staying fixed?

The camera's orbit target tracks the x-position of the newest mined block so the active mining site never drifts out of frame as the chain grows, while your manual drag-to-rotate and scroll-to-zoom input is preserved on top of that automatic pan — only the point being orbited around slides forward.

What happens to the chain if I keep tampering with blocks?

Tampering only edits one block's stored data; it doesn't re-mine anything. So every tampered block (and everything built on top of it) stays marked invalid until you reset the chain — mirroring the real-world fact that "fixing" a tampered blockchain block requires re-doing all the proof-of-work from that point forward, which is precisely what makes deep rewrites impractical.

⚙ Under the hood

This simulation dives into the core mechanics of blockchain technology, allowing you to explore distributed ledgers and cryptographic hashing in a dynamic environment. By manipulating transaction blocks and consensus algorithms, you can observe how blockchains are created and secured.

BlockchainCryptographyDistributed Ledger

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install