⚡ Bitcoin-Only. Provably Fair. Verified by Math. Every 21Stacker draw uses the same cryptographic standard that secures Bitcoin — SHA-256. We pre-commit a secret hash before entries open, then combine it with a future Bitcoin block hash to calculate the winner. 🧱 Transparent. Trustless. Impossible to fake. This is what provably fair looks like. 🎯 Answer the question. ⚡ Pay in sats. 🏆 Win Bitcoin.