Over the past few hours, some Keychat users may have noticed several strange messages like the one shown in the screenshot — “null invalid HMACtrack: decrypt failed” — when sending messages in a large group. Our current suspicion is that someone was spamming NIP-17 messages to the receiving address subscribed to by the large group. Those messages were received by the group, but failed during decryption, which led to the error shown in the screenshot.

We’re happy to see that users understand and appreciate the design of Keychat Mini Apps — combining web apps, public key login, and a Bitcoin wallet. BTW, we plan to add a Public Agent alongside Mini Apps later on. View quoted note →

We want the overall design of the Keychat protocol to be easy for anyone to understand, not just developers. View quoted note →

Through the mail analogy, you should now find it easier to understand what the Keychat protocol actually delivers: self-sovereign identity, end-to-end encryption with forward and backward secrecy, metadata-resistant addressing, decentralized transport, and a free market for message delivery where ecash stamps turn relays into competing post offices — sovereign communication. View article →

Attaching a Stamp (Client → Relay) When publishing an event to a relay that requires stamps, the client appends a Cashu token as the third element of the EVENT message array: ["EVENT", <event JSON>, "<cashu_token>"] View quoted note →

We are close to completing the development of libkeychat. libkeychat is to the Keychat protocol what libsignal is to the Signal protocol. After libkeychat is released, users should be able to quickly build their own clients using Pi agent, Claude Code, or Codex. View quoted note →

Keychat protocol is a sovereign messaging stack that integrates five layers: Identity — Nostr keypair, self-custodial with no server dependency Transport — Nostr relay network, open and self-hostable Encryption — Signal Protocol for 1-to-1 and small group chats, MLS for large group messaging Addressing — Receiving and sending addresses are decoupled from identity and continuously rotate Stamps — Cashu ecash tokens attached to messages as anonymous micropayments to relays View quoted note →

https://github.com/keychat-io/keychat-protocol/blob/main/MENTAL_MODEL.md