A place for developers to talk about building on Farcaster.

/dev

Introducing ContractScan: a same-address contract deployments search tool

Introducing ContractScan: a same-address contract deployments search tool

https://contractscan.xyz

I think we're gradually approaching the state where each protocol is the same singleton contract deployed across multiple networks. Most of the time, those deployments have the same address thanks to the CREATE2 opcode.

That makes it easy to detect them. All you need to do is to query each chain for a bytecode at the same address.

Well, ContractScan does just that. Type an address (or select one from the examples), and get a list of deployments.

- ContractScan marks the deployments that have a different bytecode
- ContractScan is open-source and self-hostable

Here's an example. EntryPoint 0.7 is a widely deployed contract. ContractScan found 40 deployments (Blockscan shows 19 btw):

Here's an example. EntryPoint 0.7 is a widely deployed contract. ContractScan found 40 deployments (Blockscan shows 19 btw): https://contractscan.xyz/contract/0x0000000071727De22E5E9d8BAf0edAc6f37da032

Another use case is to get a chain to which the contract was deployed. Say, you have an address of a Safe wallet and want to find a network is was deployed to:

Another use case is to get a chain to which the contract was deployed. Say, you have an address of a Safe wallet and want to find a network is was deployed to: https://contractscan.xyz/contract/0xd8153d5d3a2283b8c9752c152fa28b3cb7f0685c

And here's the source code: https://github.com/scope-sh/contract-scan

There's Blockscan already, why not use it?

- Blockscan has like 50 chains (I think they only support chains indexed by Etherscan), and ContractScan has 100+.
- Blockscan shows any address that has a non-empty state (e.g. a token balance)