How to play Bitcoin blackjack

Bitcoin blackjack is standard casino blackjack played with satoshis instead of dollars: you bet sats, the dealer deals from a shuffled shoe, and 21 still beats everything. On Lightning Faucet you can sit down at the blackjack table with as little as a couple of sats, and every shuffle is provably fair, meaning you can cryptographically verify after the hand that the deck order was fixed before you ever clicked Deal.

This guide is written by the team that actually operates the table. We are not going to recite generic blackjack trivia. We are going to tell you the exact rules our dealer plays by, what each button does under the hood, how to verify a shuffle yourself, and the basic strategy that fits our specific rule set, because strategy advice that ignores the rule set is worth nothing.

Start a hand in about a minute

Here is the complete path from zero to a dealt hand:

1. Create an account. An email works, or scan the LNURL-auth QR with a Lightning wallet and sign in with your keys, no password to remember.
2. Get some sats. You do not need to deposit to start. Claim the free faucet, spin the free spin wheel, or work through the earn surfaces to build a starting balance. If you want to play bigger, deposit over Lightning: the site shows an invoice QR, your wallet pays it, and the sats are credited the moment the payment settles, usually within a second or two.
3. Open the table. Head to Bitcoin blackjack, pick a chip, and press Deal. Preset chips run from 2 sats up to 25,000 sats, and 25,000 sats is the table maximum for an initial wager.

That is genuinely all of it. No KYC form before your first hand, no minimum deposit, no separate casino wallet to shuffle funds into. Your one sat balance is the same balance the faucet pays into and the same balance you withdraw from.

The exact rules our table plays

Most "Bitcoin blackjack" articles never tell you the rules of any actual table, which is odd, because the rules decide how every close hand should be played. These are ours:

| Rule | Our table | | --- | --- | | Decks in the shoe | 6 (312 cards, freshly shuffled every hand) | | Blackjack pays | 3:2 | | Dealer on soft 17 | Hits (H17) | | Double down | On any two cards | | Double after split | Allowed | | Splitting | Up to 3 splits, 4 hands maximum | | Resplitting aces | Not allowed | | Insurance | Offered when the dealer shows an ace, pays 2:1 | | Surrender | Not offered | | Table limits | 1 sat minimum, 25,000 sats maximum |

This is a genuinely player-friendly rule set, and two things in that table matter more than the rest. First, blackjack pays 3:2, not the 6:5 that has crept into a lot of real-world pits; on a 1,000 sat bet, a natural pays 1,500 sats, not 1,200. Second, our dealer hits soft 17, which nudges a couple of strategy decisions that we cover below.

One more rule that only an operator would think to tell you: the shoe is re-shuffled for every hand. There is no penetration, no running count to keep, and card counting does nothing here. We mention it so you do not waste effort on it.

What each button really does

When you press Deal, your wager is debited, the server shuffles a fresh 6-deck shoe (more on how in the next section), and deals two cards to you and two to the dealer, one dealer card face up. Every decision after that is validated and settled server-side, so a laggy connection or an accidental double click cannot corrupt a hand; the server locks the game state and processes one action at a time.

• Hit draws one card. You can keep hitting until you stand or bust.
• Stand ends your turn on the current hand and, once all your hands are done, the dealer plays out.
• Double doubles your wager, deals exactly one more card, and stands automatically. Available on any two-card hand, including after a split.
• Split turns a pair into two hands, each with its own wager equal to the original. You can split up to three times for four hands total, and each split hand can be doubled. Split aces cannot be resplit.
• Insurance appears only when the dealer shows an ace and you do not already hold blackjack. It is a side bet of half your wager that the dealer has a ten in the hole, paying 2:1 if so. If you do hold blackjack against a dealer ace, the hand simply resolves; we do not offer even money as a separate prompt.

The dealer then draws to 17 or better, hitting soft 17, and the hand settles instantly: wins, pushes, and 3:2 blackjack payouts are credited to your balance the moment the dealer's hand resolves.

If your connection drops mid-hand, nothing is lost. The full game state lives on the server, so reopening the table puts you exactly where you left off. Hands abandoned for more than 30 minutes are settled automatically by a cleanup job, so a forgotten tab never leaves your balance stuck.

How to verify any shuffle yourself

This is the part a paper-currency casino cannot offer you and the reason to play blackjack on a provably fair Bitcoin site at all.

Before you play a single hand, the server generates a secret 32-byte server seed and shows you its SHA-256 hash. That hash is a commitment: the server has locked in its seed before knowing anything about your hands. You also have a client seed, which you can set to any string you like at any time, and a nonce, a counter that increases by one with every game you play.

For each hand, the deck order comes from one number:

combined_hash = HMAC-SHA256(key = server_seed, message = client_seed + ":" + nonce)

That hash seeds a Fisher-Yates shuffle across all 312 cards in the shoe. The implementation extends the hash into a longer byte stream by repeated SHA-256 hashing, then uses 4 bytes per card with rejection sampling, a detail that matters because it eliminates modulo bias: no card position is even slightly more likely than another.

To verify: rotate your seed pair from the fairness panel. The server reveals the old server seed (and commits a new hashed one for future hands). You can then check two things independently, with nothing but open-source tools:

1. SHA-256 the revealed server seed and confirm it matches the hash you were shown before you played.
2. Recompute the HMAC for any past hand's nonce, run the same public shuffle, and confirm the deck order reproduces the exact cards you were dealt.

Because your client seed is an input the server cannot predict and the server seed was committed before play, neither side can steer the shuffle. The house cannot deal itself a ten in the hole any more than you can deal yourself an ace. This same commit and reveal scheme runs across our casino games, and a shared-deck variant of it powers our multiplayer Lightning poker tables.

Basic strategy for these exact rules

Basic strategy depends on the rules, so here is the short version tuned for a 6-deck, H17, double-after-split shoe like ours:

Always and never

• Always split aces and eights. Two aces are two chances at 21; sixteen is the worst hand in the game.
• Never split tens or fives. Twenty is a made hand, and ten is a doubling hand, not two weak hands.
• Never take insurance. The side bet pays 2:1 but the dealer's hole card is a ten less than one time in three. It loses sats over time, so decline it every time it is offered.

Hard totals

• Stand on hard 17 and up.
• Stand on hard 13 through 16 against a dealer 2 through 6; hit against 7 or higher.
• On hard 12, stand against 4, 5, or 6; hit against everything else.
• Double hard 11 against any dealer upcard. Because our dealer hits soft 17, doubling 11 into an ace is correct here, a spot where players trained on stand-soft-17 tables often just hit.
• Double hard 10 against 2 through 9; hit against a ten or ace.

Soft totals

• Soft 19 and up: stand.
• Soft 18: double against 3 through 6, stand against 2, 7, or 8, and hit against 9, 10, or ace. Hitting soft 18 into a strong upcard feels wrong and is right.
• Soft 17 and below: never stand; hit, or double against a weak dealer card when you hold soft 15 through 17 against 4 through 6.

Since our table has no surrender option, you never need the surrender branches of a strategy chart. Play the chart above and you are playing very close to mathematically sound blackjack on every hand, and at sat stakes you can drill it until it is automatic without your mistakes costing anything that matters.

A practical note on bet sizing from our side of the table: doubles and splits commit additional wagers mid-hand, up to several times your initial bet on a split-heavy hand. If you are playing near your whole balance, size your base bet so you can always afford the double or split when strategy calls for it. Declining a correct double because the sats are not there is one of the most common leaks we see in the aggregate numbers.

Sats in, sats out

Everything at the table is denominated in satoshis, and the payment rails are Lightning end to end.

• Funding without depositing: faucet claims and the earn pages pay real, withdrawable sats. Plenty of players bankroll their blackjack entirely from claims and never deposit at all. That is the point of a faucet casino.
• Depositing: the cashier shows a Lightning invoice QR; pay it from any Lightning wallet and your balance updates as soon as the payment settles.
• Withdrawing: we use LNURL-withdraw. You scan a QR (or tap a link on mobile) and your wallet fetches its own invoice and receives the sats, typically in seconds. You never construct or paste an invoice manually. If a payment attempt fails somewhere along the route, the amount returns to your balance automatically within a couple of minutes.

There is no withdrawal approval queue for ordinary amounts and no conversion step, because your balance already is bitcoin.

Where to go from here

The fastest way to learn blackjack is to play it at stakes where mistakes cost almost nothing, and a 2 sat chip is about as close to nothing as real-money blackjack gets. Open the blackjack table, set your client seed first so every shuffle is verifiable from hand one, and play the strategy above until it is automatic.

When you want a change of pace, the same provably fair system and the same sat balance carry over to dice, baccarat, and the rest of the casino floor. Same seeds, same verification, same instant Lightning cashouts.