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Independent project, not affiliated with Anthropic
affaan-m avatar

Nodejs Keccak256

affaan-m/ecc
1.9k installs240.8k stars
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-code

Installs into .claude/skills of the current project.

CodeRabbit
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Capacitor - Shared memory for your team’s coding agents.
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CodeScene MCP ServerCodeScene MCP Server
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Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
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belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
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CodeRabbit
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Try For Free →
inference shell
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create and run specialised agents in minutes
build now →
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Plug Mailtrap into your AI workflow and let it handle the email.
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Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →
Capacitor - Shared memory for your team’s coding agents.
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Make coding agent sessions - Searchable, Shareable, Vendor-neutral & Scored.
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CodeScene MCP ServerCodeScene MCP Server
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Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
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belt - the only tool your agent needs
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belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →
Files
SKILL.md

Select a file.

Featured
CodeRabbit
CodeRabbit
AI writes the code. CodeRabbit catches the slop.
Try For Free →
inference shell
inference shell
create and run specialised agents in minutes
build now →
MCP-ready Email SendingMCP-ready Email Sending
MCP-ready Email Sending
Plug Mailtrap into your AI workflow and let it handle the email.
Connect Mailtrap MCP →
Make your agent a DeFi expert
Make your agent a DeFi expert
Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →
Capacitor - Shared memory for your team’s coding agents.
Capacitor - Shared memory for your team’s coding agents.
Make coding agent sessions - Searchable, Shareable, Vendor-neutral & Scored.
Try For Free →
CodeScene MCP ServerCodeScene MCP Server
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Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →
Give your AI the whole web as clean markdownGive your AI the whole web as clean markdown
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Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →
belt - the only tool your agent needs
belt - the only tool your agent needs
belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →
Categories
Finance & TradingWeb3 & Blockchain
First SeenJul 14, 2026
View on GitHub

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nashsu avatar
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