Fun, fast, seemless entry. Bitcoin prizes. Publicly verifiable winners.
Choose the prize you want to win.
Lightning checkout. Confirmed in seconds.
The first block mined after close selects the winner.
Fun, fast, easy entry. Bitcoin prizes. Publicly verifiable winners.
Choose the prize you want to win.
Lightning checkout. Confirmed in seconds.
The first block after draw closes determines the winner. Anyone can validate.
Share 21 STACKER with friends, family, or your audience and earn 21% sats on every ticket they ever buy. Lifetime commissions, paid via the Lightning Network.
You earn sats on every future ticket your referrals purchase, as long as they play.
Payouts made via the Bitcoin Lightning Network. Fast, low-fee, and built for Bitcoin natives.
Create an account, grab your referral link, and start earning Bitcoin in minutes.
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We don’t pick winners. The Bitcoin network does — using a public block hash plus our pre-commit. Anyone can verify the result.
On the Winners page we publish the block hash, pre-commit, and the full calculation so you can reproduce the exact winner.
Every draw is provably fair. Every winner is published. Real Bitcoin wins, out in the open.
Transparent results you can inspect.
Entries freeze the moment a draw closes.
Verified winners on the public board.
Answer the skill question correctly, choose your number of entries, and pay using Lightning or Bitcoin on-chain. You’ll receive an email confirmation and your entries appear in your account dashboard.
Yes — 21Stacker is a global competition platform. Most countries can participate except prohibited regions listed in our Terms & Conditions.
Yes. Every competition includes a postal AMOE (free entry) route. Full instructions are available on our AMOE information page.
When a draw closes, all qualifying entries are frozen and a winner is selected using a provably-fair block-hash method based on the Bitcoin blockchain and a published server seed.
Winners are announced on the website and contacted by email. Names are shown as First Name + Last Initial until verification is complete.
Yes. Once the winner is verified, the Bitcoin prize is paid either via Lightning (smaller prizes) or on-chain (larger prizes).
Yes. 21Stacker is Bitcoin-only. We accept Lightning Network payments and on-chain Bitcoin transactions.
Entrants must be 18+, live in an eligible region, and answer the skill question correctly. VPN/proxy use and entries from prohibited regions are not allowed.
Our draw system uses publicly verifiable randomness created using the next Bitcoin block hash and our published server seed. This guarantees transparency and removes all human influence.
