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docs: what is a sUDT-ERC20 Proxy Contract #168

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docs: what is a sUDT-ERC20 Proxy Contract #168

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4 changes: 4 additions & 0 deletions solidity/erc20/README.md
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## sUDT-ERC20 Proxy Contract

The [sUDT-ERC20 Proxy Contract](./SudtERC20Proxy_UserDefinedDecimals.sol) is a special smart contract written in Solidity, which is designed to utilize the Godwoken and Polyjuice frameworks. This contract provides a way for EVM code to interact with ERC20 standard interface that is interfacing directly with Polyjuice to control sUDT tokens on Layer 2 as if they were ERC20 tokens.

For security reason, developers should only use this [SudtERC20Proxy_UserDefinedDecimals bytecode](./SudtERC20Proxy_UserDefinedDecimals.bin) which code hash will be checked in `transfer_to_any_sudt` pre-compiled contract.

## Compile Solidity Contract in ethereum/solc:0.8.7 docker image
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