Continue with a Base Account (Base's smart-contract wallet), a passkey, your own Ethereum wallet, or its recovery phrase. No password and no email needed.
Create your account and sign in with a Base Account, Base's smart-contract wallet. No browser extension: a wallet of your own, protected by a passkey.
The ERC-4337 smart account's signature is verified on the Base chain (ERC-1271 / ERC-6492). No transaction, no gas, and it works before the wallet is deployed.
If you have already registered one, sign in quickly with Face ID, Touch ID, or Windows Hello on this device.
That key is server-custodied and passkey-gated, not a wallet: Kotoba Cloud can decrypt it, so a compromise of this service could sign as you. Your passkey stops anyone else. For sole custody, use your wallet or recovery phrase below — Kotoba Cloud never sees those keys.
Base's official method: sign the SIWE message as the Base Account (a smart-contract wallet) this passkey owns, verified on the Base chain. No transaction, no gas.
Connect your wallet and sign a one-time sign-in message.
No transaction, gas fee, or private-key sharing is involved. Both EOA and smart-contract wallets (ERC-1271 / ERC-6492) are supported.
Enter your wallet's 12–24-word recovery phrase. The phrase is turned back into a key inside this browser only; all that is sent is an address and a signature.
The account derived is m/44'/60'/0'/0/0 — the same Ethereum account MetaMask and other wallets show as “Account 1”. It is the same identity you get by connecting the wallet.
Separate the words with spaces. Case does not matter.
Only if your wallet was set up with a BIP-39 passphrase (the “25th word”).
A newly created phrase is shown once and is never stored by Kotoba Cloud. Lose it and this identity can never be entered again.
Enter the 6-digit code from your authenticator app.
Use one of the recovery codes you saved when you turned this on. Each one works once.