Contract Complete

Sui Blackjack

Provably fair on-chain blackjack with native randomness

MoveSui RandomnessVue 3TypeScript@mysten/sui

The Problem

Most blockchain games use off-chain randomness which can be manipulated. Players have no way to verify the game is fair.

The Solution

A fully on-chain blackjack game using Sui's native randomness module. Every shuffle and card draw is verifiable on-chain.

Key Features

Sui native randomness for provably fair shuffling
Treasury system with house edge management
3:2 blackjack payout ratio
Split, double-down, and insurance mechanics
389-line Move contract (clean, auditable)

Architecture

The Move contract manages game state, card deck, and treasury. Each game session creates a new randomness context. The frontend calls PTBs (Programmable Transaction Blocks) to play moves.

Challenges

Understanding Sui's randomness module semantics
Managing treasury funds safely with proper access control
Encoding card values efficiently in Move structs

Lessons Learned

Sui randomness is powerful but requires careful context management
Move's ownership model makes game state management elegant
On-chain games need careful gas optimization

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