How do I know how many assets are being transfered during the 'verify' callback?

[lock9]

Hi,

The ´verify´ method doesn't use any parameters. What is the best / recommended way that I can securely obtain the amount that the user is trying to transfer from a contract? In other words, how can I get the parameters of the ´transfer´ invocation that triggered the ´verify´ method on my smart-contract?

Thanks

[roman-khimov]

The ´verify´ method doesn't use any parameters

It can have parameters if you need, nothing forbids/prevents that.

What is the best / recommended way that I can securely obtain the amount that the user is trying to transfer from a contract?

The problem though is that your verify parameters and transfer parameters are completely different unrelated things, so you can only get transfer parameters if you're to very carefully parse tx.Script in verify. Related: #2577.

[lock9]

Thanks @roman-khimov .
I guess that the best path is to have a custom 'withdraw' method on the smart-contract.