Summary
If you're building Ethereum tooling in JavaScript or TypeScript, you've probably already shipped this bug. Node's `crypto.createHash('sha3-256')` implements NIST SHA3, not the Keccak-256 variant Ethereum actually uses, and the outputs are silently different. This skill teaches Claude to catch the distinction and use the right helpers from ethers, viem, or web3.js when computing function selectors, event topics, storage slots, or deriving addresses from public keys. It includes grep commands to audit your codebase and side-by-side examples showing why `nistSha3 === keccak` returns false. Small footgun, massive consequences if you get it wrong.
Install to Claude Code
npx -y skills add affaan-m/everything-claude-code --skill nodejs-keccak256 --agent claude-codeInstalls into .claude/skills of the current project.
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →
Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →
Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →
On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →
Files
SKILL.md
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Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →First SeenMay 16, 2026
