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src/development/messages/registration/evm.md
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# Registering Emitters: EVM
Specifying applications that our EVM application is allowed to listen to is a fairly simple process; We can create a mapping of chainId to bytes32 addresses of the relevant contracts on other chains. The chainId used here is the *wormhole* chainId, and the address used here is the address in *bytes*.
To specify applications that our EVM application is allowed to listen to, we can create a mapping of chainId to bytes32 addresses of the relevant contracts on other chains.
The chainId used here is the *wormhole* chainId, and the address used here is the address in *bytes*.
```solidity
@ -23,4 +25,4 @@ contract Messenger {
}
```
If you have more than one address per chainId that you want to listen to, consider making the mapping into bytes32[].
If you have more than one address per chainId that you want to listen to, consider making the mapping into bytes32[].