blockchain
Expert guidelines for blockchain development including CosmWasm, Cosmos, and cross-chain patterns
What this skill does
# Blockchain Development You are an expert in blockchain development, smart contracts, and distributed systems. ## Core Principles - Prioritize security and correctness over premature optimization - Design for immutability and deterministic execution - Implement comprehensive testing and auditing practices - Follow established patterns for the target blockchain ecosystem ## CosmWasm Development (Cosmos) ### Rust Best Practices - Use Rust's type system for safety guarantees - Leverage CosmWasm's contract model for state management - Implement proper entry points (instantiate, execute, query) - Handle errors explicitly with custom error types ### IBC Integration - Follow IBC protocol standards for cross-chain communication - Implement proper packet handling and acknowledgments - Test with multiple chains in development - Handle timeout scenarios gracefully ### State Management - Use efficient storage patterns (Item, Map, IndexedMap) - Minimize storage operations for gas efficiency - Implement proper migration paths for upgrades ## Cross-Chain Patterns ### Message Passing - Design idempotent message handlers - Implement proper replay protection - Handle partial failures gracefully - Log all cross-chain operations ### Security Considerations - Validate all incoming messages - Implement proper access controls - Use time-locked operations for sensitive actions - Monitor for unusual activity patterns ## Testing Strategies - Unit tests for all contract logic - Integration tests with simulated blockchain state - Fuzz testing for edge cases - Security audits before mainnet deployment ## Documentation - Document all public interfaces - Maintain deployment and upgrade guides - Keep architecture decision records - Provide clear examples for integration
Related in Web3
xaut-trade
IncludedBuy or sell XAUT (Tether Gold) on Ethereum. Supports market orders (Uniswap V3) and limit orders (UniswapX). Wallet modes: Foundry keystore or WDK. Delegates non-XAUT intents to registered skills (e.g. Polymarket prediction markets, Hyperliquid trading). Triggers: buy XAUT, XAUT trade, swap USDT for XAUT, sell XAUT, swap XAUT for USDT, limit order, limit buy XAUT, limit sell XAUT, check limit order, cancel limit order, XAUT when, create wallet, setup wallet, polymarket, prediction market, bet on, odds on, hyperliquid, perp, perpetual, long, short, open long, open short, close position, leverage.
qfc-openclaw-skill
IncludedQFC blockchain interaction — wallet, faucet, chain queries, staking, epoch & finality, AI inference
gate-dex-trade
IncludedExecutes on-chain token swaps via Gate DEX. Use when user wants to swap, buy, sell, exchange, or convert tokens, or bridge cross-chain. Covers full swap flow: price quotes, transaction build, signing, and submission. Do NOT use for read-only data lookups or wallet account management.
hunch
IncludedDiscover, bet on, track, and settle Hunch prediction markets in natural language. Trigger when a user wants to bet, take a position, or get odds on a crypto outcome — token market-cap milestones and flips, launchpad races (Bankr vs pump.fun volume / #1-days / launches over a cap), token head-to-head outperformance, mcap strike-ladders, and up/down price rounds. Also trigger on "what can I bet on about $TOKEN", "odds on …", "take YES/NO on …", "show my Hunch bets", "did my market resolve". Settles in USDC on Base via x402 (≤ $10 / bet); every bet returns an on-chain proof.
opensea
IncludedQuery NFT data, trade on the Seaport marketplace, and swap ERC20 tokens across Ethereum, Base, Arbitrum, Optimism, Polygon, and more.
polymarket
IncludedTrade on Polymarket prediction markets (CLOB V2) from a Privy EOA wallet. Search markets, place/cancel orders, manage positions. No private key handling. Use when the user wants to bet on event outcomes (e.g. "buy YES at 0.65 on the ceasefire market", "what are my open positions", "close my Trump bet").