🔐 Hash Generator

What Is a Crypto Hash?

A cryptographic hash function takes any input and produces a fixed-length output. The same input always gives the same output, but any tiny change produces a completely different hash — making hashes ideal for verifying data integrity.

Common Uses in Web3

• Function selectors: First 4 bytes of keccak256(function signature) identify smart contract functions
• Event topic IDs: keccak256 hashes of event signatures filter Ethereum logs
• IPFS content IDs: Files are identified by the hash of their content
• Merkle trees: Used in Ethereum state storage and Bitcoin verification

Keccak256 vs SHA256

Ethereum uses Keccak256 (not standardized SHA3-256). Bitcoin uses SHA256. For production Ethereum work, use ethers.keccak256() for verified results.