I made a little project called pingkey it is a messaging app works like traditional mailing. You setup relays as your mailbox, people write letters and post them to you. Each letter must contain a POW which then turn into a unique POW stamp. It is that simple and I imagine it will become a alternative contact card for those people who are old enough that just hate social network and prefer to keep this simple way just like me. Feel free to try it and contact me and give some feed back.
@Cody 好奇现在 jumble 有没有采用 nip-65 模式?加载主页的时候,会聚合我关注的人的 relay list 再去找它们抓消息吗?