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

034fc73b44bcfd52fb4401da7d7e79c6696a4f70e3b5ef099881ac6907e040bcf9
044fc73b44bcfd52fb4401da7d7e79c6696a4f70e3b5ef099881ac6907e040bcf9358583db19fd43e69671b09fb724b22a7c6d646632af57a9d8ba7dd5452c59e9

Ethereum

0x3E57E2b3eD49E847561B8f5355B1a21F84Fee87A

Bitcoin

1CYjPDtHioTVXu48YLiGCT95c7bto34Wx3
L12gTjLU6k7J7J7m1WwFz9JF8ZCxKXd13rWgzaVXwUnRJQnvLNuz
5JgMGa9wdC8KNpNvUJf82Aap9xnJX2W11eVvvNdpnshegMqiBPg

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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