♠️ Blackjack

Decentral Games is standard single deck blackjack accommodating 1-4 players.


To play, each player may click into a slot on the table, and select a chip(s) amount by clicking on the floating glowing chips. Chip values are:

1st Chip

2nd Chip

3rd Chip

4th Chip




100 MANA

500 MANA


0,5 DAI

2,5 DAI

10 DAI

50 DAI

After the first player selects the initial bet amount, an 8 second countdown begins and all other players must place a bet before the countdown ends and the cards are dealt. The objective of the game is to get the sum of your cards as close to 21 as possible without going over 21, and each player plays against the dealer. Wins pay out 2x initial bet and blackjacks pay out 2.5x initial bet.

Players can choose to play as they wish, regardless of hand value, but the dealer must hit on 16 and lower and stay on 17 and higher.


When the dealer is showing an ace, each player has the option to buy insurance at a price of half their initial wager. Purchasing insurance protects the player protects against the scenario that the dealer's hidden card is a 10 value card (King, Queen, Jack, or 10) and thus has a blackjack.

If purchased and the dealer ends up having a blackjack, the player gets their initial bet back but pays the half bet fee. If purchased and the dealer doesn't have a blackjack, the player eats the insurance cost and game continues as usual.

Splitting Pairs

When the player is dealt two cards of the same value (for example, two 6s, two aces, or even a 10 and a King), they have the option to split the pair. This means that the two cards are split into two separate hands, each with the bet that the user initially wagered, and the player continues as if they are playing both hands individually.

Doubling Down

On each hand, a player has the option to double down on their first move. Doubling down doubles the player's initial bet and forces the player to hit one card, then stay.

House Edge

The house edge in blackjack is 0.5%.

Source Code

You may view our roulette smart contract here.