セキュリティ

秘密鍵からアドレスへ

32バイトのsecp256k1秘密鍵からBitcoin(P2PKH)とEthereum(EIP-55)アドレスを導出 — すべてブラウザ内で完結

Private Key → Address

Derive Bitcoin (P2PKH) and Ethereum (EIP-55) addresses from a 32-byte secp256k1 private key

Public Key

03feb894aba2deb85cd901630c16f9e8364f294e0e90ab23a308b183a155226076
04feb894aba2deb85cd901630c16f9e8364f294e0e90ab23a308b183a155226076f1527e7dc4306d72cba522ae666ed60b50263c3aad77ed5bf356849c0e0859ad

Ethereum

0xfe0750B32a9c2cA2442E3f8d6C6a961eD3181dca

Bitcoin

1AJMm9KBYFPVegc7F2754RaQpCHJok2BmL
L34ZF26R2hyChhyypj7GhhyYJkRaBpxLf74P7oL9H2zTs9hEcHcF
5K94E9QRvrcPb9NyNguAuGdNbP5D3uZ2HLVrsUiVcMPY1bGfrSp

How it works

  • BTC and ETH both use the same secp256k1 curve, so a single 32-byte key derives addresses on both chains.
  • ETH address = last 20 bytes of keccak256(pubkey_xy), then EIP-55 checksum casing.
  • BTC P2PKH = base58check(0x00 || RIPEMD160(SHA256(pubkey))).
  • WIF (Wallet Import Format) is the base58check encoding of the private key for use in Bitcoin Core / Electrum.

Never paste a real private key controlling real funds into a website.

This tool computes everything locally with no network calls, but you cannot verify that with the naked eye. Use it only for testnet keys, learning, and burner wallets.

Powered by the audited @noble/curves and @noble/hashes libraries. Pure JavaScript, no WASM, no network.

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