Official discussion thread for Add ERC: Cross-Chain Messaging Gateway by Amxx · Pull Request #673 · ethereum/ERCs · GitHub
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What is the purpose of the return argument (bytes4) in executeMessage?
This is to mitigate selector clashes, to make sure the receiver acknowledges the protocol it’s engaging in.
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What would be an example of an attack / things going wrong if the Gateway does not check the return value of executeMessage?
I think I get it now, this is for ensuring that the Destination Gateway only can call the executeMessage function of the receiving application and not something else.