More Draws Coming Soon
⚡ More Exciting Draws Coming Soon
How it works
Fun, fast, seemless entry. Bitcoin prizes. Publicly verifiable winners.
Pick a draw
Choose the prize you want to win.
Answer a Bitcoin Question + pay
Lightning checkout. Confirmed in seconds.
Verify the winner
The first block mined after close selects the winner.
⚡ Lightning payments
₿ Bitcoin-only prizes
🔍 Fully transparent
⏳ Limited entries
How it works
Fun, fast, easy entry. Bitcoin prizes. Publicly verifiable winners.
Pick a draw
Choose the prize you want to win.
Answer a Bitcoin Question + pay
Lightning checkout. Confirmed in seconds.
Verify the winner
The first block after draw closes determines the winner. Anyone can validate.
⚡ Lightning payments
₿ Bitcoin-only prizes
🔍 Fully transparent
⏳ Limited entries
⚡ Live Bitcoin Competitions Below
🎟️ Entry: 2,100 sats ≈ $—
• updating…
More Draws Coming Soon
⚡ More Exciting Draws Coming Soon
Live Fiat Value of Our Competitions
Check Out Your Odds
Earn Bitcoin for Life — 21% Partner Program
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.
21% Lifetime Commission
You earn sats on every future ticket your referrals purchase, as long as they play.
Paid in Lightning Sats
Payouts made via the Bitcoin Lightning Network. Fast, low-fee, and built for Bitcoin natives.
Instant Activation
Create an account, grab your referral link, and start earning Bitcoin in minutes.
Join the 21% Partner Program
Already a customer? You can still earn — just log in and grab your link.
PROVABLY FAIR
Bitcoin settles every draw.
We don’t pick winners. The Bitcoin network does — using a public block hash plus our pre-commit. Anyone can verify the result.
Next Bitcoin block
#924779
Block hash
000000…9e6a3d
Pre-commit
5352c3…74466d
Draw ID
GENESIS-0001
SHA-256
(block_hash + pre_commit)
→
random_number
then
random_number % tickets_sold
Same inputs → same winner. No edits. No discretion.
1
Entries freeze at close
We lock the sold ticket list. No late entries. No changes.
2
Bitcoin provides the randomness
We combine the next block hash with our public pre-commit.
3
Modulo selects the winner
We convert the random number into a position in the frozen list.
That ticket wins.
🔍 Public Bitcoin data
🔒 Pre-commit published
📐 Verifiable maths
On the Winners page we publish the block hash, pre-commit, and the full calculation so you can reproduce the exact winner.
21 STACKER Winners
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.
Question? Check our FAQs!
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.