Gas payment of the mint of ERC20 Token

Asked Sep 27 '20 at 14:48

Active Sep 27 '20 at 14:48

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I have the follow use case: There is an off-chain service, like a game, which will generate/mint new ERC20 tokens when some requirements are met by end-users. Since the users will get profit (in terms of ERC20 tokens), I do not want to pay the transaction fee of calling the mint function in the ERC20 contract.

Question: How can I make users pay the transaction fee of mint while under the control of my off-chain service (e.g. not violating the rule of minting new tokens)?

I know usually, this gas-paid-by-someone-else use case is often something like: the user do not need to pay the transaction fee, while a third-party will pay the fee. And there are a lot of mature libraries can do this, like openzeppelin GSN. But in my case, this is different.

I found a related question here talking about the general solution to such problems. But I prefer not to implement too many things by myself, since there may be security issues. Are there any libraries that can help me achieve my goal?

Thanks in advance.

asked Sep 27 '20 at 14:48

Troublor

Perform the minting as part of one of the user's transactions (for example, when that user withdraws his/her tokens). – goodvibration Sep 27 '20 at 14:59
@goodvibration Thanks for comment. But if I do this way, how can I make sure if the user is withdrawing the tokens without violating any regulations? – Troublor Sep 28 '20 at 01:11
Go over each regulation, and make sure that it is not violated. – goodvibration Sep 28 '20 at 05:07
But the thing is: the regulations are not in smart contracts. They are coded in off-chain service. I think I should let users directly call the smart contract functions. – Troublor Sep 28 '20 at 07:16
So add them to the smart contract and then verify them. – goodvibration Sep 28 '20 at 07:18
Thanks for your advice. But in my case, I cannot do this. – Troublor Sep 28 '20 at 09:33
Of course you can. – goodvibration Sep 28 '20 at 09:35

Gas payment of the mint of ERC20 Token

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