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

0288e95630254369b22fbbe51acef33c481cd23c24f28b14b2fcceef019ccfc553
0488e95630254369b22fbbe51acef33c481cd23c24f28b14b2fcceef019ccfc553bbe147ce47649f9526ab33d1a7d0a5a73b3730c71cf094eff279867aa5c946b0

Ethereum

0x4cb537b0DEC6f40B3ee6e8CDA815555fD485f38D

Bitcoin

17GZgnZ5YSDrBe6iEErdvA9HvNBau7S2Sh
L47gunPKUKhHpGVNGX7eTaiymwqHhAZYqGg1wN2urQ3F4EMUsytu
5KNuYSgwwDr1Bi7t3A68afTH32YnUE3Pcrmdv6fx2DvXNcRjDmw

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.

お探しのツールはありますか?

コミュニティの声をもとに無料ツールを作っています。ワークフローに欲しい機能を提案してください。

秘密鍵からアドレスへ — 無料ツールオンライン | FreeTool24 | FreeTool24