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Sorry if my question was already discussed.

Is it possible to implement such a smart contract or contracts that in result can transfer eth or ERC20 tokens forth from ANY to B account and back from B to ANY in one single transaction? And token transfers will be reflected in the transaction's receipt event log or debug traces.

Account B is my custodial account, so it has no opportunity to approve anything to anybody.

I am going to parse just deposit transactions to B accounts initiated by third party smart contracts and I do not want to be fooled by such a malicious logic when somebody deposits the amount to B and takes it back.

2 Answers 2

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It's not possible, no matter if it's the same transaction, nobody can get assets from B if it has not given approval

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No, that logic (to allow for transfers without approval) would have to be implemented in the ERC20 contract itself.

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