A digital signature proves that the corresponding key authorized a message under the signature system. It does not prove that the signer understood the message, or that the transaction is harmless.
Read transaction details, spending allowances, recipient addresses and network information before signing. Some approvals let an application spend tokens later. A message with no immediate network fee can still have consequences, depending on its content and protocol.
Worked example
Approving an unlimited token allowance can permit future transfers by the approved contract. Disconnecting a website in the wallet is not necessarily the same as revoking that allowance.
Check your understanding
Does a signature without a network fee have to be harmless?
Show explanation
No. The signed authorization may still grant rights or enable later actions.
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