A wallet is a way to authorize changes to a financial account. Its address identifies the account; its signing keys supply the authority. The important question on a confirmation screen is therefore quite ordinary: who will be able to do what with my assets after I agree?
This is why a wallet can lose money even when its encryption works perfectly. The key can remain secret while its owner signs a permission that gives another contract more control than intended. Understanding the permission is as important as protecting the key.
Three actions that look similar
Connecting a website usually lets it see an address and request signatures. A transfer moves an asset. An approval lets a specified spender move a specified token, subject to an allowance. Closing the website or disconnecting it does not necessarily remove that onchain allowance. MetaMask’s approval guide explains the fields to inspect.
Suppose you have 5,000 tokens and want to deposit 100 into a lending application. A 100-token allowance and an unlimited allowance can both enable the deposit. The second also creates authority over additional tokens that remain in the wallet or arrive later, subject to the token’s rules. The convenience is fewer approval transactions on future visits; the cost is broader standing authority.
The spender is not necessarily the website operator’s ordinary wallet. It is often a smart contract. Check its address against the application’s official documentation, along with the network, token, and spending cap. A correct-looking logo supplies none of those facts.
A signature can matter without a gas payment
Some permissions are signed offchain and submitted later by someone else. Under ERC-2612, a permit can set a token allowance through a signed message. The absence of a network fee at signing does not make the message harmless.
There is a subtle distinction in the deadline. In that standard, the deadline limits when the permit can be submitted. It does not automatically erase the allowance afterward. Imagine a permit with a noon deadline being submitted at 11:59. The authorization can remain after noon unless the resulting allowance is spent or revoked under the token’s rules. Other signature systems can work differently, so read what the displayed expiry actually controls.
A useful confirmation screen should let you identify the action, spender, asset, amount, and relevant network or contract. If it offers only an unexplained block of data, you have not yet established the financial action. Resolve that uncertainty before signing rather than using the wallet’s ability to sign as evidence that the request is sensible.
Key security and spending authority
A hardware wallet helps keep a key off an internet-connected computer. It still signs the action approved on its trusted display. The Ethereum security guide treats recovery material and transaction verification as separate responsibilities. A device password cannot repair an exposed recovery phrase, and a well-protected phrase cannot undo a malicious approval.
Separating an activity wallet from longer-term holdings can reduce how much one permission exposes. That separation only helps if the wallets really have separate authority and their backups are understood. Ten addresses derived from one exposed recovery phrase do not create ten independent security boundaries.
After an interaction, compare the resulting balance and remaining permissions with what you intended. Revoking an allowance addresses that spender’s authority; replacing compromised signing keys addresses a different problem. Disconnecting a website is enough to end a connection, but it does not undo either kind of authority.