ERC-20 & PERC-20
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We introduce a new type of token – PERC20 (private ERC-20). It has two main differences from regular ERC-20 standards:
default balanceOf and allowance functions are disabled in favor of your own implementation function. You should implement some access control logic or use msg.sender to check who sent that call. If eth_call was sent from EOA and was signed, it will recover msg.sender from provided signature, otherwise, it msg.sender will be empty address
Transfer and Approval events are disabled, since they can leak sensitive information
You can find example of PERC-20 contract in the interaction guide: Sample PERC20 contract
Swisstronik is compatible with ERC-20 tokens and other non-fungible token standards (ERC-721, ERC-1155) that are natively supported by the EVM.
The main problem with the usage of the ERC-20 and other non-modified ERC token standards is that it will disable a lot of functionality such as private transfers and data protection (balance is visible to anyone)
Only OpenZeppelin versions up to 4.9.6 are supported. OpenZeppelin version 5 and above are not supported
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