proposal

type Proposal struct {
	Source         uint8  // Source domainID where message was initiated
	Destination    uint8  // Destination domainID where message is to be sent
	DepositNonce   uint64 // Nonce for the deposit
	ResourceId     types.ResourceID
	Metadata       message.Metadata
	Data           []byte
	HandlerAddress common.Address
	BridgeAddress  common.Address
}