Sign & Verify

Sign & Verify does two related things: sign an arbitrary message with your connected wallet, and verify a message-and-signature pair to recover the address that produced it. Signing needs a wallet; verifying needs neither a wallet nor a network, and runs fully in your browser.

What it does

• Sign a text message with your wallet using EIP-191 personal_sign.
• Verify a signature by recovering the signer's address, and optionally check it against an expected address.

Sign

The Sign tab requires a connected wallet.

1. Type your message.
2. Click Sign message and approve the request in your wallet.
3. The result card shows the signature (copyable), the signer address, and an echo of the message.

Signatures use EIP-191 personal-sign. Rejecting the request in your wallet is handled gracefully; it is not an error.

Verify

The Verify tab works with no wallet and no network.

1. Paste the message and the signature.
2. Optionally enter an expected signer address.
3. Click verify. The tool recovers the signer's address from the signature. If you provided an expected signer, it shows a clear match (valid) or mismatch result.

An incorrectly formatted signature is reported inline.

Step by step

1. On Sign, type a message and sign it with your wallet.
2. On Verify, paste a message and signature to recover the signer.
3. Optionally compare the recovered address against one you expect.

Fees and gas

Free. Signing a message is an off-chain cryptographic operation: it is not a transaction, costs no gas, and is not broadcast. Verifying is pure local computation.

Limits and safety

• A signature proves that the holder of a private key signed a specific message; it does not move funds or approve anything on-chain.
• Verification happens entirely in-browser, so nothing about the message or signature is sent anywhere.
• Only sign messages you understand. Be cautious of prompts to sign unfamiliar or structured data from untrusted sites.