A wallet’s “Sign” prompt does not, by itself, tell you whether money will move. Check what the wallet is signing and what the site, contract, or other verifier can do with it: a signature might authenticate a login, authorize spending that can happen later, or approve an on-chain transaction.
What a wallet signature actually means
A signature authenticates particular data under the relevant signing and verification rules. Its consequences depend on the signed payload and on the software that checks or executes it. A signed message is not automatically a payment, but an off-chain signature can still grant a permission that someone uses later.
Distinguish signing from execution. Signing produces authorization data; a transaction or contract call may need to be submitted and executed before its effects occur. What the payload permits—and who can submit or verify it—determines whether those effects include moving funds.
How to distinguish common Ethereum signing requests
| Request type | What is signed | What can happen next |
|---|---|---|
| Ethereum transaction | Transaction data for on-chain execution | If submitted and executed, it may transfer assets or call a contract. Inspect the transaction’s actual action; it could do more than a simple transfer. |
personal_sign message |
A message using the EIP-191 prefix scheme | The signed data is not itself an Ethereum transaction, but an application may use it for authentication or another application-level purpose. |
eth_signTypedData_v4 typed data |
Structured fields, such as a token permit | A verifier or contract may use the signature later. The fields and the verifier’s rules determine its effect. |
Transactions: inspect the action, not just the label
A transaction signature is for transaction data that can be published on chain. If it executes, it may transfer an asset, interact with a contract, or perform another action encoded in the transaction. A wallet prompt that mentions a transaction is therefore not enough to tell you what will happen: review the destination and execution details the wallet displays.
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personal_sign: a message is not a transaction
EIP-191 defines prefixed signed data and identifies version 0x45 with personal_sign messages. The standard states: “Thus, any EIP-191 signed_data can never be an Ethereum transaction.” The authors, Martin Holst Swende and Nick Johnson, are describing the encoding; that does not establish that every application using a signed message is harmless. Read the message and understand which site or service will verify it. MetaMask documents this method as a common choice for readable messages and authentication, including Sign-In with Ethereum (SIWE).
Typed data: readable fields are not a safety guarantee
EIP-712 defines hashing and signing for structured data. A domain can provide context such as a chain and verifying contract, and MetaMask says typed-data signing can display structured information in a useful format. But EIP-712 explicitly says: “It does not include replay protection.” That sentence is from the standard by Remco Bloemen, Leonid Logvinov, and Jacob Evans. A nonce, expiry, domain, or familiar-looking name only helps in the context of the verifier’s implementation; inspect the actual fields and how they are enforced.
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Why a permit can authorize a later payment
ERC-2612 defines a token permit function that changes an allowance using a signed message. Its typed fields include the token owner, spender, value, nonce, and deadline. When the permit call validates, it sets the allowance and increments the nonce. Any address may call permit.
Signing a permit is not necessarily an immediate token transfer. It can instead authorize the named spender to use the allowance, with the token contract’s rules determining what that means. Review the spender and allowance value especially carefully, as well as the token contract and deadline. A later caller may submit a valid permit, so the fact that no funds moved at the moment of signing does not mean the signature has no payment consequence.
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A practical review before signing
- Verify the site or app. Check the domain through a trusted route. MetaMask advises checking URLs or contract addresses and verifying them through official project channels when a warning appears.
- Identify the signing method. Look for the method name if the wallet or app shows it.
personal_signtypically signs a prefixed message;eth_signTypedData_v4signs structured data; MetaMask documentseth_signas deprecated. A method name alone is not a verdict. - Read the payload’s consequential fields. Depending on the request, look for the chain, asset or token, destination or spender, amount or allowance, nonce, deadline, and verifying contract. For an ERC-2612 permit, check its owner, spender, value, nonce, and deadline.
- Find out who will use the signature. Ask what validates it and what that verifier can do. An off-chain service checking a login message is not equivalent to a token contract enforcing a spending allowance.
- Stop if the request is unexplained. Do not sign a payload that is unreadable, inconsistent with the action you intended, or not independently explained. MetaMask’s security alerts and transaction simulations can provide additional signals, but MetaMask says simulations do not detect every threat.
What this guidance covers
These distinctions apply to the Ethereum standards EIP-191, EIP-712, and ERC-2612, and to the MetaMask EVM signing guidance described here. They do not establish a universal rule for every blockchain, wallet, smart account, or token implementation. For a specific request, the relevant chain, wallet, and contract behavior matter.
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