Offchain Approval with ERC20 Permit and Ethers.js

[@smartcontractprogrammer]

0:00 - Intro 0:26 - ERC20 permit 3:07 - Test script 4:13 - Write ERC20 token contract 5:44 - Back to writing test 7:05 - What message to sign for permit? 9:04 - Finish up the test script 9:48 - Execute test Take a course www.smartcontract.engineer/

[@mohamadhammoud4326]

I'm so grateful for this channel. Please may you have a video regarding meta transactions?

[@meka4996]

Amazing man! Thanks

[@cypherarts1291]

@Smart Contract Programmer where do I define the contract owner pays for the transfers?

[@adamstraus6677]

You're a homie

[@leonardman5935]

so who is the new owner of the token, the contract owner of vault or it is only staying in this contract vault?

[@cypherarts1291]

one word: wow!

[@jjmorosr]

sos un capo!!!

[@reoyamanaka7566]

Amazing video. Could you please make a frontend tutorial that integrates this? Thanks so much

[@veliea5160]

Why Uniswap ERC721Permit.sol permit function is calling `_approve` at the end. you say we avoid calling approve if we use permit

[@hackerhubnft7675]

Some contracts have a bool parameter allowed. Why is that ?

[@mangola-x8u]

How is it offline transaction? How does OpenSea payment system work for bidding? In above example it looked we have clubbed transferFrom and approve together is some way? Am i understanding it right?

[@smartcontractprogrammer]

How is it offline transaction? Permit replaces approve. Approve must be called by owner of token (msg.sender) Permit can be called by anyone if they have the signature from the owner n above example it looked we have clubbed transferFrom and approve together is some way? Am i understanding it right? Correct. It can also be modified to be called by anyone. permit(owner, spender, amount, signature) transferFrom(owner, spender, amount)

[@DeadBabyFoetus]

Awesome! Video suggestion: Which contract is msg.sender when performing calls/ delegate call :)

[@afeem7605]

hey man, could you share resource for learning hyperledger fabric if you have any? would really appreciate it:)

[@CoderGaming]

Hi.! Thank you for this quality educational videos. I learned a lot from your videos. I just wanted to request you to make video about Gas Station Network (GSN). Thank once again 👍

[@eduardobenitez6376]

A later implementation that the Vault would need is to know how many tokens belong to each person that has depositedWithPermit? Great Vid!

[@smartcontractprogrammer]

Video about vault is already published

[@faranahmadk7401]

@@smartcontractprogrammer please guide. I can't find that vault video. Thanks

[@chenghung3407]

is permit function also needed to be written in the ERC20 token contract?

[@smartcontractprogrammer]

no, it's not part of ERC20 standard

[@善哥-j6v]

the signature only require a deadline and amount,is this mean 1 signature can use in all erc20_permit token?

[@billamazing6527]

usdt & usdc not support erc20, is there any way use permit to send them?

[@rickdev]

In which scenario will we use this vault with depositWithPermit? it's a nice implementation detail but I can't understand where this will fit

[@smartcontractprogrammer]

deposit - 2 transcations (approve and deposit) depositWithPermit - 1 transaction (no approve, replaced by permit)

[@Michael.A.Grinstead]

Gas optimisation