The Useful Nonce
Drag the operating point across matrix sizes to see how the Freivalds overhead approaches 0% — and how much of Bitcoin's 150 TWh becomes AI compute under PoUW.
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Mine Twice: The Cryptographic Construction That Turns a Matrix Multiply into a Block Proof
Bitcoin burns ~150 TWh/yr on SHA-256 nonces that prove nothing. Komargodski & Weinstein showed a Freivalds randomisation check turns any matmul into a valid proof-of-work at only 3/(2N) overhead — the same GPU seconds train your model and mine the block.
8 min read ⬢ interactive