Token approvals: Connecting a wallet does not mean allowing tokens to be transferred.
In common ERC-20 interactions, approve sets an allowance for a specified contract to spend a certain amount of a token; the contract can later call transferFrom within that allowance, without necessarily asking you to confirm each time. Disconnecting from a website usually does not revoke on-chain approvals.
So check not only the website address, but also the spender, token, and allowance. Unlimited approvals are convenient, but they increase your exposure if the contract is attacked or maliciously exploited.
You can revoke approvals you no longer need using trusted tools, but revoking usually requires gas and cannot recover assets that have already been transferred. Some signatures can also grant permissions, so don’t treat “no gas paid” as proof of safety.#钱包安全 #BlockchainKnowledge
In common ERC-20 interactions, approve sets an allowance for a specified contract to spend a certain amount of a token; the contract can later call transferFrom within that allowance, without necessarily asking you to confirm each time. Disconnecting from a website usually does not revoke on-chain approvals.
So check not only the website address, but also the spender, token, and allowance. Unlimited approvals are convenient, but they increase your exposure if the contract is attacked or maliciously exploited.
You can revoke approvals you no longer need using trusted tools, but revoking usually requires gas and cannot recover assets that have already been transferred. Some signatures can also grant permissions, so don’t treat “no gas paid” as proof of safety.#钱包安全 #BlockchainKnowledge