Keychat message’s rawdata 
Discussion
Are the message sender/receiver public like with Nostr DMs? Trying to understand the tradeoffs here
Why does the damus relay get no sats? Can the user change this?
Damus relay doesn’t add collect ecash stamp function. So it is free.
Let's imagine that Alice and Bob are good friends. Alice is traveling in the Americas, and Bob is traveling in Europe, each visiting a new place every day. They have agreed to send each other a letter daily, sharing their travel experiences. Therefore, their sending and receiving addresses are constantly changing.
Similarly, in Keychat, the sending and receiving addresses of messages keep changing just like Alice and Bob's addresses.