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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

02b232e93135f551e81f49b62b3c872bac044de91998ccd16edb1a56b9e982db5e
04b232e93135f551e81f49b62b3c872bac044de91998ccd16edb1a56b9e982db5e9cd995e65b82aed2c65285459551e1508becc6e6c0422fa52e8e24c10a5acce8

Ethereum

0xFD1D3EB65589C8aCE9a50a658c9524e7DdE866D5

Bitcoin

16YTb7ZncgJkNzGXay6HibMHACvpRFpUdz
L4Q4Hxz9mdBgSXeywM69YwyXkwrqU1nZWPoiiJRtTxGqtcM7vBAb
5KScdvTziq5EU5gREDi3PeNsUBAUkH3AdZoqRJzkNy2KnGDSBSn

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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