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51% Attack & Double-Spend Race

Interactive 3D simulation of a Proof-of-Work 51% attack: an honest chain and an attacker's secret fork race block-by-block, so you can see how attacker hashrate share and confirmation depth determine whether a double-spend actually succeeds.

Cybersecurity3DModerate60 FPS

Blockchain security ultimately rests on a probability race, not a guarantee. This simulation plays out Bitcoin's original double-spend scenario: an honest network mining a public chain against an attacker secretly mining a rival fork with a chosen share of total hashrate. Every block is a weighted coin flip; watch how raising the attacker's hashrate share or lowering the number of confirmations a merchant demands changes how often the attacker's fork catches up and overtakes the honest chain, forcing a chain reorganization that reverses an already-accepted payment.

⚙ Under the hood

Interactive 3D simulation of a Proof-of-Work 51% attack: an honest chain and an attacker's secret fork race block-by-block, letting you see how attacker hashrate share and confirmation depth determine whether a double-spend succeeds.

Three.jsblockchaincybersecuritycryptographyproof-of-workdouble-spend

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install