EVM - Sending And Receiving Messages
On EVM-based chains (Ethereum/Base), messages are sent and received via a Portal contract, which usually sits behind an upgradeable proxy.
Sending Messages
Any contract (or user) that want to send a message can call the sendMessage
function:
A per-message toll of 0.00001 ETH
will need to be sent for each message. Note that the function identifies the sender as msg.sender
.
Receiving Messages
After the required signatures have been collected, anyone can call the following function:
The receiveMessage
function will call the destination contract and provide details about the message that has been relayed. It then proceeds to mark the nonce and source chain combination as 'used', thus preventing a message from being relayed twice.
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