Welcome to 1stc1s
Your comprehensive toolkit for cryptocurrency development, hash generation, and blockchain utilities. All the tools you need in one place.
Hash Generator
Generate various hash algorithms including MD5, SHA-256, SHA-3, Keccak and more
Function Signature
Search Ethereum function signatures and 4-byte identifiers
Address Tools
Generate addresses, convert to checksum format, and validate Ethereum addresses
Unit Converter
Convert between Wei, Gwei, Ether and other Ethereum units
Transaction Decoder
Decode raw transactions and analyze input data
ABI Tools
Generate function selectors, event hashes, and encode/decode ABI data
Keystore Tools
Generate private keys, mnemonic phrases, and keystore files
Smart Contract Tools
Analyze bytecode, calculate gas costs, and compute storage slots
Why Choose 1stc1s?
Fast & Reliable
Lightning-fast processing with reliable results every time.
Secure
All processing happens locally in your browser for maximum security.
Free to Use
All tools are completely free with no registration required.