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Shaky ERC20 Allowances
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Paul Razvan Berg
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Lightning talk about the dangers of ERC20 allowances. Part of Devcon 5 in Osaka.
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Shaky ERC20 Allowances
1.
SHAKY ERC20 ALLOWANCES
2.
3.
4.
5.
function createStream(address sender,
address recipient, address tokenAddress, uint256 startBlock, uint256 stopBlock, uint256 payment, uint256 interval) { ... IERC20 tokenContract = IERC20(_tokenAddress); uint256 allowance = tokenContract.allowance(_sender, address(this)); require(allowance >= deposit, "contract not allowed to transfer enough tokens"); ... require(tokenContract.transferFrom(_sender, address(this), deposit)); }
6.
7.
1. UI +
UX 📱
8.
9.
2. BACKEND 🖥
10.
ERC-777 Not Working With
Existing Tokens ☹
11.
ERC-1155 META WRAPPER Requires
Users To Convert Tokens ☹
12.
SIGN TWO TXS Slightly
Worse UX, But Backwards Compatible 😊
13.
14.
THANK YOU 🙏
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