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

034848247654712f6c1f20cb61424932819350197abd465840a94693c34362d99f
044848247654712f6c1f20cb61424932819350197abd465840a94693c34362d99fccfb324562bdbfef49185d104bbf8460955877eff32dd4162e707061c7e75319

Ethereum

0xb6d549034761af3351C2e2E0be538D22253F2929

Bitcoin

1BJAjw6AjDaXPN8yMQNq6D8SHSTKNHjfNZ
L2Jq9DnjXNtFBqwHo3Nj9FtbaveSSv4DADAi17g2EWopzxFMf3Qi
5Jy9eCxg65413TVcXNP9Bw8ACK3bK78XPvxfk5ENaRRf4hT4t3L

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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