Our team is pleased to announce the addition of Blackjack game to the platform. As the first game on the DAO.Casino blockchain, Blackjack will demonstrate it’s technical capabilities by showcasing our algorithms in action.

Game Details

DAO.Casino Blackjack is US-style Blackjack with two side bets bolted on - 21+3 and Perfect Pairs.

As in any Blackjack, cards from 2 to 10 are worth their face value, while Face Cards (Jack, King, Queen) are all worth 10 a piece. Aces are worth 1 or 11, whichever is preferred by the player at the time of playing. A soft hand would include an Ace worth 11. The game is using 8 decks in the shoe, the cards are shuffled and the entire deck is cut in half virtually (+/- 10%).

DAO.Casino Blackjack is based on the American version of the game, as it’s more fun and in favor of the player. The main difference between European and American Blackjack is the ‘hole’ card. Dealers are dealt two cards before the hands commence in American Blackjack - one face up, one face down, with the face down card known as the ‘hole’ card.

European Blackjack dealers only receive one card face up, before the hand is played. In the American game, if the card facing upward is an Ace, the dealer peeks at the ‘hole’ card to see if it has a value of 10. If so, then the game is over before it starts. For players, this brings a small advantage as the hand ends before any financial decisions (splits and doubles) are made.

Playing Blackjack

The game begins when the dealer deals one card to the player, followed by one to himself. Next a second card is played to the player, and another to the dealer - this time face down. As we previously mentioned, dealer’s face down card is known as the hidden or hole card. If it’s an Ace, Face or Ten card, he will then peek to check for Blackjack.

Blackjack is called if 21 is reached using only 2 cards - an Ace and a Face Card or 10.

Blackjack will beat any other combination of cards.

If the player gets Blackjack, the dealer has a quick glance at his own card to check to see if he has Blackjack - if not the game is over and the player wins. This pays out at 3:2. Note that if the dealer has an Ace, he offers insurance to the player, which pays out at 2:1. This insurance is a special bet which only pays out half the original bet.

Say nobody has Blackjack, the player can then decide whether to ‘Stand’ and stick with the hand they have if it is close to 21, or ‘Hit’ for one more card. Players can also ‘Double Down’, dealing one more card and doubling the bet. Players can also choose the ‘Split’ the deck if the numbers are similar.

Players can only ‘Split’ and ‘Double Down’ on the first round - only ‘Stand’ and Hit’ are available from then on. Players aim to get as close to 21 as possible - hopefully on it - but automatically lose by going ‘Bust’ if their cards go over 21. Once the player finally decides to stand on a hand that seems closest to 21, the dealer has a turn.

The dealer will take all logical decisions to play the hand dealt, settling on a minimum of 16. If the dealer has less than the subsequent player (and the player didn’t bust his hand), the player wins the game. The dealer will always stand on a soft 17 and the house edge stands at 0.461%.

DAO.Casino Blackjack also employs a 6-Card Charlie rule. This is where the player automatically wins if they reach 6 cards without going bust. It shaves the house edge by 0.16% in favor of the player, sadly, it only occurs around once every 400 hands.

Side Bets on DAO.Casino Blackjack

In terms of side bets, our version of Blackjack incorporates the two most popular in world - 21+3 and Perfect Pairs. 21+3 is where players analyse their original two cards and the dealer’s one upturned card. If these three cards happen to form a straight, 3-of-a-kind, flush, or straight flush, then the player wins outright.

Perfect Pairs places a bet on the chances of the first two cards a player receives being a pair. In this side bet, three kinds of pais pay out - perfect pairs, mixed pairs, and colored pairs. Perfect pairs have the same face value, color, and suit. Mixed pairs have the same face value but different suits and colors, and color pairs have the same face value and color.

Blackjack Tech Advantages

Signidice verifiable deck

DAO.Casino’s version of Blackjack will use the extended Signidice algorithm to shuffle the deck, making it possible to check the deck and position of the cards within the decks.

At the start of the game, users send the bankroller entropic signals. Once received, the bankroller signs these actions with his key, which is known by the player. The signature, which is generated by this process, creates the final entropy needed to complete the shuffle process.

Once the deck is shuffled via entropy, the bankroller generates a Merkle Tree or hash tree from the shuffled deck - the Merkle Tree root is subsequently sent to the player. This means that every time the player or dealer gets dealt a card, the bankroller sends a Merkle Tree proof, which undeniably proves the position of the cards during the deal - preventing fraud and cheating.

Another tech advantage comes from the players receiving previous bankroller signatures. This enables the player to check previous deck shuffles to ensure the deck was shuffled using the bankroller’s signature, that the bankroller signature was generated using the player’s entropy and known bankroller key.

In short…

The upcoming release of Blackjack puts DAO.Casino one step further forward in the crusade for Gambling 3.0. A classic favorite in the gambling world, Blackjack is not only a popular choice for early adopters, it also manages to showcase the Signidice algorithm in action, while utilizing smart contracts for deposits.


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