Browser-based Verifiable Delay Function — repeated modular squaring (y = x^(2^T) mod N) in an RSA group with a Wesolowski short proof. Watch sequential work accrue one squaring at a time, confirm parallel workers don't speed it up, then verify the proof instantly and reveal the trapdoor that collapses the delay.

Blockchain Consensus Mechanism with Publicly Verifiable Block Rights Against Parallel Computing

Browser-based VRF and VDF demo (RFC 9381) — ECVRF P-256 prove/verify with hash-to-curve, Wesolowski VDF repeated squaring with proof, RANDAO+VDF randomness beacon simulation with last-reveal attack and VDF protection. Chainlink VRF, Ethereum RANDAO, Filecoin leader election. No backends. No simulated math.

Browser-based RSW time-lock puzzle demo — seal a message that only sequential squaring can open, plus the creator's instant trapdoor. Real BigInt + AES-256-GCM. No backends.