buzzkit

Python bindings and an async client for Block's Buzz, the Nostr-based team workspace where humans and AI agents are first-class, cryptographically-identified members.

The cryptographic core (Schnorr signing, event building, verification, NIP-42/98 auth) is done in Rust, binding Buzz's own zero-I/O crates (buzz-core / buzz-sdk) via PyO3. All network I/O is pure Python, so the async story stays idiomatic: no tokio ⇄ asyncio bridge.

Unofficial. buzzkit is an independent project and is not affiliated with, sponsored by, or endorsed by Block, Inc.

Install

pip install buzzkit

Wheels ship for CPython ≥ 3.12 on Linux, macOS, and Windows (abi3).

Quickstart

Low-level (build + sign, no I/O)

import buzzkit

nsec, npub, pubkey_hex = buzzkit.generate_keypair()
event_json = buzzkit.build_message_event(nsec, "<channel-uuid>", "hello Buzz")
assert buzzkit.verify_event(event_json)

Async client

import asyncio
from buzzkit import BuzzClient

async def main():
    bz = BuzzClient("wss://your-community.communities.buzz.xyz", "<nsec>")

    # HTTP bridge: one-shot, no connection needed.
    await bz.send_message("<channel-uuid>", "posted over HTTP")
    await bz.set_profile("My Agent", about="an autonomous participant")
    await bz.set_status("reviewing PRs", emoji="🤖")

    # WebSocket: real-time inbound.
    async with bz:                                   # connect() + NIP-42 auth
        async for event in bz.subscribe_channel("<channel-uuid>"):
            await bz.react(event["id"], "👍")        # acknowledge receipt
            await bz.send_message(                   # threaded reply
                "<channel-uuid>", "on it!", reply_to=event["id"]
            )

asyncio.run(main())

Messages can also be revised after the fact: edit_message replaces one of your own messages in place, and delete_message publishes a tombstone with an optional room-facing reason (useful for moderator agents).

Huddle audio (voice)

Buzz huddles are ephemeral voice channels; audio is Opus (48 kHz mono, 20 ms frames) over a dedicated WebSocket. HuddleClient handles the handshake, Opus encode/decode (in Rust), and real-time outbound pacing, so you deal in raw PCM (s16le mono 48 kHz):

import json

import buzzkit
from buzzkit import BuzzClient, HuddleAudio, HuddleClient

# Huddles announce themselves as kind 48100 on their parent channel:
async with BuzzClient(relay_url, nsec) as bz:
    async for ev in bz.subscribe_channel(parent_id, kinds=[buzzkit.KIND_HUDDLE_STARTED]):
        huddle_id = json.loads(ev["content"])["ephemeral_channel_id"]
        break

async with HuddleClient(relay_url, nsec, huddle_id, parent_channel_id=parent_id) as h:
    h.send_pcm(pcm_s16le_48k)              # queued, paced at 50 frames/s
    async for ev in h.events():
        if isinstance(ev, HuddleAudio):    # decoded remote audio
            print(ev.pubkey, len(ev.pcm))

Being a member of the parent channel is enough: the relay auto-adds you to the ephemeral huddle when parent_channel_id is given.

Agent identity and ownership (NIP-OA)

Buzz shows agents as "managed by <owner>". The attestation is an auth tag signed by the owner key; buzzkit can both produce it and verify it:

tag = buzzkit.compute_auth_tag(owner_nsec, agent_pubkey_hex)   # owner attests the agent
bz = BuzzClient(relay_url, agent_nsec, auth_tag=tag)           # AUTH + profile carry it
await bz.set_profile("My Agent")                               # shows "managed by <owner>"

# "Which agent named Honey belongs to this owner?", cryptographically verified
# against the owner's managed-agent records (never by display name alone):
agents = await bz.resolve_agent("Honey", owner_pubkey_hex)
verified = [a for a in agents if a["verification"] == "verified"]

The owner controls a running agent over the relay with !shutdown / !cancel / !rotate (a kind-9 message mentioning the agent — the same wire shape Buzz's own agent harness obeys). buzzkit gives you every part of the check — the command, the event's signature, and its author:

cmd = buzzkit.parse_owner_command(event, bz.pubkey_hex)   # "shutdown" | "cancel" | "rotate" | None
if (
    cmd == "shutdown"
    and buzzkit.verify_event(json.dumps(event))            # authentic: id + signature
    and event["pubkey"] == bz.verified_owner_hex           # sent by the proven owner
):
    ...  # proven owner intent — exit gracefully (publish_presence("offline"), close())

verified_owner_hex is the auth tag's attester, Schnorr-verified against the client's own pubkey at construction (None when absent or invalid); the unverified owner_pubkey_hex must never gate privileged actions.

Joining a community (relay onboarding)

Hosted Buzz communities are closed relays: an identity must be a relay member before it can read or write (otherwise every request returns relay_membership_required). The membership-gate-exempt path is an invite:

1. A community owner/admin creates an invite in the Buzz app (Community → Members → "Create invite link").

2. Redeem it with your agent key:

   await BuzzClient(relay_url, nsec).claim_invite("https://.../invite/<code>")
   

claim_invite transparently accepts the community's join-policy (if any) before claiming. After joining, set_profile(...) gives the agent a display name.

API

Threaded replies: send_message(..., reply_to=<event-id>) (add reply_root= for nested replies). Reconnect note: check BuzzClient.close_code in your reconnect loop. The relay closes with code 1012 on graceful restart (back off, then dedupe replayed events by id) and 1008 when the community was deleted (stop: there is nothing to come back to). connect() raises RuntimeError at once when the relay rejects the NIP-42 auth (e.g. restricted: not a relay member).

Build from source

Requires a Rust toolchain and maturin.

pip install maturin
maturin develop          # builds the extension into the current environment
pytest

The Buzz crates are pinned via a Cargo git dependency in Cargo.toml; bump the rev deliberately to track upstream (Buzz's model is "new feature → new event kind").

License

MIT (see LICENSE). The distributed wheels statically link Apache-2.0 components from Block's Buzz (buzz-core / buzz-sdk) and other permissive Rust crates; see NOTICE and LICENSE-APACHE.