Definition
Revoke approval means changing a token permission so that an approved spender no longer has the previous authority. For many ERC-20 tokens, this involves setting the allowance to zero. NFT permissions and signed permit systems can use different rules. Revocation is distinct from disconnecting a wallet from a website, deleting an application, or hiding an asset in the wallet interface.
How It Works
A trusted allowance-management interface can show permissions associated with a wallet on a particular network. The holder reviews the token and spender, then authorizes the appropriate change. An on-chain revocation normally requires a network fee and confirmation before it is effective. Permissions on another network or under a different approval system must be reviewed separately. Pending signatures may require their own invalidation mechanism rather than appearing as a standard allowance.
Key Considerations
Revocation limits future use of that permission; it cannot reverse a completed transfer. A malicious spender may act before a pending revocation confirms, so submitting a transaction is not itself proof that the risk has ended. Never enter a recovery phrase into a supposed revocation tool. If the private key is compromised, revoking allowances is insufficient because an attacker can sign new transactions or permissions. Check the final on-chain state and retain only the access required for applications you still intend to use.