Demo 0
Free-play blackjack

BlackjackPad

Velvet felt, six decks, and a dealer who stands on soft 17

  • 6 decks · fresh shoe each hand
  • Blackjack pays 3:2
  • Dealer stands on soft 17
  • ≈99.6% RTP with basic strategy
  • Provably fair

Play the demo with local chips, or sign in with your Solana wallet to keep chips, claim daily chips and climb the weekly leaderboard. Chips have no cash value.

Dealer
Place a bet
Bet 0Demo chips · local only

How it works

Classic single-player blackjack against the dealer. Beat the dealer's total without going over 21. A two-card 21 is blackjack and pays 3 to 2. Everything is decided on the server from seeds you can check, and an open hand survives a reload.

The shoe

Six 52-card decks, shuffled fresh for every hand. No card counting, no hidden cut card: each hand is its own provably fair shuffle.

The dealer

Draws to 16 and stands on every 17, soft 17 included. With an ace or ten showing, the dealer peeks: a dealer blackjack ends the hand before you act, so you only ever lose your first stake to it.

Double

Double your stake on any first two cards and take exactly one more card. Doubling after a split is allowed.

Split

Split two cards of equal value into separate hands, up to four hands. Split aces get one card each and can't be split again. 21 on a split hand pays 1:1, not 3:2.

Payouts

Blackjack 3:2 · win 1:1 · push returns your stake. On an odd stake the half chip of a 3:2 payout is rounded down. No insurance, no surrender.

Your table

Main table up to the table limit. Holders of the project's coin get the holders' table with higher limits and a small bonus on winning hands.

Basic strategy for these rules

HitStandDouble (hit if you can't; soft 18 stands)Split

The "Strategy hint" switch on the table highlights the move from this chart. It is generated from the same code that the RTP figure below was measured with.

Fairness mapping and RTP

  1. Each hand uses one nonce of your seed pair. The bytes are HMAC_SHA256(serverSeed, clientSeed:nonce), then clientSeed:nonce:1, :2 and so on, read 4 bytes per float: b0/2^8 + b1/2^16 + b2/2^24 + b3/2^32.
  2. The shoe starts in order: position p holds card p mod 52 (rank = id mod 13, A 2 … 10 J Q K; suit = floor(id / 13), ♠ ♥ ♦ ♣). It is shuffled with a forward Fisher–Yates using the first 311 floats: for i = 0 … 310, j = i + floor(f[i] × (312 − i)), swap positions i and j.
  3. Cards come off the top in order: you, dealer up card, you, dealer hole card, then each card as it is needed (your hits, doubles and split hands left to right, then the dealer's draws). Your moves are saved with the hand, so the verifier below replays it card for card.
  4. While a hand is open, the server keeps the shoe and the hole card to itself and your seed can't be rotated. The page only ever receives the cards that are face up.
≈ 99.6%RTP per first stake with perfect basic strategy (house edge 0.38% ± 0.04%)
40 Msimulated hands with this exact engine and the chart above
4.5%of hands are a player blackjack
3:2blackjack · 1:1 wins · stake back on a push

Blackjack has no closed-form RTP: it depends on how you play. The figure is a simulation of 40 million hands of this engine played with the chart above (95% interval ±0.04%). Playing by hunch usually costs 1–3%. Holder win bonuses come on top for holders.

Holder perks

Sign in with your wallet to keep chips, claim daily chips and appear on the leaderboard. Holding the project's coin unlocks bigger daily chips, a small bonus on wins and the holders' table.

Daily chips reset at 00:00 UTC. Claiming on consecutive days adds a streak bonus (+10% per day, up to +50%). The holder tier is read from your wallet's token balance on Solana at sign-in and every 10 minutes. Perks are bonus play only: chips have no cash value.

Provably fair

Every result is decided on the server from seeds you can check. Before you play you see the SHA-256 hash of the server seed. Each play uses HMAC-SHA256(serverSeed, clientSeed:nonce), and the game's mapping below turns those bytes into the result. When you rotate, the old server seed is revealed, so you can re-run every past result yourself.

Your seeds

Sign in to get your own seed pair. Demo plays use a local seed in your browser.

Verify a result

Paste a revealed server seed, the client seed and the nonce. The result is recomputed in your browser.

Leaderboard

Net chips won from play (payouts minus stakes; holder bonus not counted, so every tier competes equally) by signed-in wallets. Real recorded plays only. Demo chips never count. The week runs Monday to Sunday, UTC.

#WalletTierNet chipsPlaysWagered

Responsible play

  • There is nothing to buy here, and nothing you win here can be cashed out.
  • Take breaks. Results are random, and the house edge stated on this page applies to every play.
  • If gambling ever stops being fun for you or someone you know, free confidential help is available, for example from BeGambleAware.org (UK) or 1-800-GAMBLER (US).