51% Attack & Double-Spend Race (2D)

This 2D companion drives the exact same Nakamoto double-spend race as the 3D version — a merchant releases goods once a payment is buried under k confirmations on the honest chain, and a dishonest miner controlling a hashrate share q secretly mines a rival fork from one block earlier, hoping to overtake the honest chain and force a reorg that reverses the payment — but renders it as two flat racing lanes read left to right instead of a 3D block tower. Where the 3D scene lets you orbit the race, this version adds something the camera can't show: a live strip chart plotting the running "actual success rate" against Satoshi Nakamoto's closed-form probability curve as races accumulate, and a second panel tracing that same probability across every possible attacker hashrate share from 5% to 95% at once, with the current setting marked — so you can see exactly where today's parameters sit on the whole risk curve, not just watch one outcome at a time.