Summary
Prevents a silent footgun in Ethereum development: Node's `crypto.createHash('sha3-256')` returns NIST SHA3, not the Keccak-256 that Ethereum actually uses, and the two produce different hashes for identical inputs. This matters when you're computing function selectors, event topics, storage slots, or deriving addresses from public keys. The skill shows you the correct helpers from ethers, viem, and web3.js, plus grep commands to audit your codebase for dangerous `createHash('sha3')` calls. If you've ever wondered why your locally computed signature or selector didn't match on-chain data, this is probably why.
Install to Claude Code
npx -y skills add affaan-m/ecc --skill nodejs-keccak256 --agent claude-codeInstalls into .claude/skills of the current project.
Agent, run crypto. Access onchain data & trade routes via 1inch.
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Notes, actions and memory. Without a meeting bot. First month 100% off.
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Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
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Integrate web data into your AI product. One API to scrape website & brand data.
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Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
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Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Give your AI agent a complete email layer—sending, inbound inboxes, and sandbox testing.
Get 4K emails/month free →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →First SeenJul 14, 2026
