relay

type Message struct {
	From      kad.ID
	To        kad.ID
	Hash      [hashSize]byte // TODO: Hash should be a method, not a field, since nodes should independently compute the hashes to be safe.
	SeenPeers []byte
	// Code is a single byte that indicates the type of Data so that Data can be properly deserialized.
	Code byte
	Data []byte
	// SeqNum is an incrementing sequence number (which wraps around 255, since it is of type byte). Messages with identical Code and Data but different SeqNums will hash differently.
	SeqNum byte
}