Shuffle Blackjack Verifier
Verify the fairness of your Shuffle.com and Shuffle.us Blackjack card deals using cryptographic proof
Understanding Shuffle Blackjack
Game Statistics
How It Works
clientSeed:nonce:round; each round gives 8 floats
floor(float × 52), from a full deck: nothing is shuffled
100% Private
All verification happens entirely in your browser. Your seeds and bet data never leave your device - we don't collect, store, or transmit any information.
How to Verify Shuffle Blackjack Results
Step 1: Get your seed data from Shuffle
To verify a Blackjack bet, you need three pieces of data:
- Server Seed (Unhashed): Shuffle reveals it when you rotate your seed pair. Open the Blackjack bet in your bet history, rotate the pair from its Provably Fair section, and the bet's details then show the unhashed server seed.
- Client Seed: Found in the same bet details section. This is the seed you set before the bet.
- Nonce: Each bet has a unique nonce. Find it in your bet details alongside the seeds.
Note: Shuffle reveals a server seed only when you rotate the seed pair, not after each round. Every bet made on the old pair can then be verified.
Step 2: Enter your data in the form above
Paste your data into the verification form:
- Enter your Client Seed exactly as shown on Shuffle
- Enter the Server Seed (Unhashed) from your bet details
- Enter the Nonce for the specific bet you want to verify
The verifier calculates the card sequence using Shuffle's exact HMAC-SHA256 algorithm.
Step 3: Compare the card sequence with your bet
After clicking Verify, you'll see the deal:
- Your two cards and the dealer's up card and hole card, with each hand's total, then the full 52-card stream in order
- Compare your hits, doubles and the dealer's draws with cards 5 onward, in the order they were dealt (after a split, one card to each hand first)
- If they match exactly, the bet was provably fair
If results don't match, double-check you're using the correct unhashed server seed and nonce for that specific bet.
Frequently Asked Questions
What is the house edge in Shuffle Blackjack?
Shuffle's own game record gives its Blackjack a 0.52% house edge (99.48% RTP). The game deals from an unlimited deck, a natural blackjack pays 3:2, and when the dealer plays its hand it draws to 16 and stands on every 17.
Does this verifier work for both Shuffle.com and Shuffle.us?
Yes! Both Shuffle.com (international) and Shuffle.us (US sweepstakes) use identical provably fair algorithms for Blackjack. This verifier works for both platforms - just enter your seeds and nonce from either site.
How many decks does Shuffle Blackjack use?
Shuffle Blackjack has no shoe: it deals from an unlimited deck. Every card is drawn from a full 52-card deck, card floor(float × 52) from the list ♦2, ♥2, ♠2, ♣2 up to ♣A, so each draw has the same odds and the same card can appear twice in a hand. Nothing is shuffled.
What does the Blackjack verifier show?
The verifier shows your two cards and the dealer's two with each hand's total, and the full 52-card stream in order. Card 1 goes to you, card 2 is the dealer's up card, card 3 goes to you and card 4 is the dealer's hole card. Card 5 onward goes out in the order the hand is played: your hits and doubles, then the dealer's draws. That order matches every revealed Shuffle Blackjack bet we checked (83 of them).
Is my bet data safe when using this tool?
Absolutely. All verification happens 100% client-side in your browser using JavaScript. Your seeds, nonces, and bet data never leave your device - we don't collect, store, or transmit any information to our servers.