Challenges

• Synchronizing off-chain game state with on-chain events without latency or data loss
• Designing a flexible inventory system supporting lock/unlock/level/deck mechanics
• Encoding game traces for on-chain verification while keeping gas costs minimal
• Building reliable wallet-based auth that works across multiple Sei wallet providers

Solutions

• Event-driven architecture listening to smart contract events with retry and fallback logic
• Modular inventory service with atomic bulk-update operations for seamless in-game transitions
• Compact ABI-encoded game traces combining wave, gold, duration, and character into minimal calldata
• Nonce-based message signing with ethers.js verifyMessage for provider-agnostic wallet authentication

Key Features

• Game session engine with full lifecycle management
• Wallet-based authentication via signature verification
• Scroll-based inventory and 5-skill deck building system
• Persistent save data with full game state serialization
• On-chain game trace verification on Sei Network