How draws are fair

Robinhood Chain has no on-chain randomness service yet, so the games that need luck plug into a randomness source through one interface. Today that source is our beacon; when a verifiable randomness service arrives on the chain, the houses switch to it.

The beacon

Before any draw, we publish the tip of a hash chain on chain: a long list of numbers where each is the hash of the next one. Every draw reveals the next number down the chain, and the contract checks it hashes to the one before. We can’t pick a number: each one was fixed the moment the chain was published.

The beacon’s number is then mixed with the round’s entropy, built from every buyer’s own random seed and the order they bought in. Neither we nor any player knows the result before the round closes.

If something goes wrong

If a reveal doesn’t arrive within an hour, the draw fails and anyone can start it again. After three failed draws, or with fewer than two players, the round refunds everyone in full. An Up/Down round nobody settles within three days refunds everyone too.

Games without luck

FOMO3D needs no randomness: the last buyer when the timer runs out wins. Up/Down reads Chainlink’s price history for the lock and close times, so the result is whatever the market did.