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lets say that theres a contract where you can deposit a erc20 the usual process is for you to first approve this contract to be able to spend your and then you will call this function deposit when this function is called it calls .transfer from so thats two transactions approve and then transfer from however some erc20 contract allows you to prove and transfer from in a single transaction so lets take a look here i have a standard interface for the erc20 contract what well do first is define the function called permit the function permit takes in the owner the spender and the amount to be spent the signatures and the deadline for the last time that the signature is valid if the signature is valid then anyone can call this function to approve the spender to spend value amount of tokens from the owner and the signature will be signed by the owner back in our bulk contract since we added the function permit inside the ierc20 i renamed this to irc 20 per minute so ba