[Feature]: Support for minimal proxy contracts (EIP-1167)

Is there an existing issue for this?

[X] I have searched the existing issues

SUMMARY

Detect EIP-1167 proxies, show information about the target contract (and whether it's verified)

DESCRIPTION

EIP-1167 minimal proxy contracts have a well known bytecode format, unfortunately they can also not be verified using Sourcify.

This makes it difficult to find information about a contract if it was deployed using minimal proxies (such as clone factories).

For example, the following contract is an EIP-1167 proxy: https://explorer.oasis.io/testnet/sapphire/address/0xbA7F3eE55b7939294caFA0F1e096E79722e1BD88/code#code

The runtime bytecode is 0x363d3d373d3d3d363d73243e9b626bc3ca61795600ed5295377423cd4e695af43d82803e903d91602b57fd5bf3, the target of this contract is 0x243e9b626bc3ca61795600ed5295377423cd4e69 - the target contract is verified.

For more details on the minimal proxy: https://blog.openzeppelin.com/deep-dive-into-the-minimal-proxy-contract

So, while the proxy contract isn't verified, the target of the proxy is verified.

Suggestion:

In the 'Verification' row, if it's an EIP-1167 proxy, show that it's a proxy, and extract the destination contract with a link.

oasisprotocol / explorer