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

037182bb65602fe0541bec5982a46df5b0a26687119fb138f4799a63ae5b3a4de9
047182bb65602fe0541bec5982a46df5b0a26687119fb138f4799a63ae5b3a4de9c520cd10c15ff91b30fd1c7bedba212bd31cb9f749554b6f491edfe520d9a097

Ethereum

0xE51C79BB786129daA740A4B6011dd52Dd60C2176

Bitcoin

1HfDwP1AqchRdWLnjsSLasrJ4tMJ28iUn6
L3WuDRw3nVdqXUoQPRdZgEt8q3QaSRk2fB5UPSQdL68a1y7Aw7MK
5KF2QfGsUXWBzf1zrwX2y1t1R2TBkNTy7PDo5dZzd3XGBgXps4J

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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