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71 lines
3.0 KiB
Markdown
71 lines
3.0 KiB
Markdown
# Direct message privacy model (NIP-17 / NIP-59 / NIP-44)
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This guide summarizes how bitvid delivers private direct messages, how relay
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hints are chosen, and which user controls affect delivery. It is meant to be
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read alongside the protocol references in `docs/nips/17.md`, `docs/nips/59.md`,
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and `docs/nips/44.md`.
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## Privacy layers: rumor → seal → gift wrap
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When privacy mode is enabled, bitvid uses the NIP-17 pipeline:
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1. **Rumor (kind 14 / 15)**: a plaintext DM or attachment payload is created.
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2. **Seal (kind 13)**: the rumor is encrypted with NIP-44 to produce a sealed
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event signed by the sender.
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3. **Gift wrap (kind 1059)**: the seal is encrypted again with NIP-44 using a
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freshly generated ephemeral keypair. The outer wrap is what relays receive.
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This layered approach hides the sender/recipient metadata and message timing
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from public relays while still allowing the receiver to unwrap the message.
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bitvid randomizes timestamps for seals and wraps to reduce correlation, and
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publishes a sender copy of the wrap so the sender can sync their own history.
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## Relay hint selection
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Relay hints decide where gift-wrapped NIP-17 events are published. Selection
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uses the following priority order:
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1. **Explicit hints** – If the caller provides `recipientRelayHints` or
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`senderRelayHints`, those are used immediately.
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2. **Recipient discovery** – Otherwise, the client queries the configured read
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relays for the recipient's `kind:10050` relay list and uses any `relay` tags
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it finds.
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3. **Fallback relays** – If no relay list is found, the client falls back to the
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configured write relays (or the default relay list), and flags the selection
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as a privacy fallback.
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This logic is shared by the DM service helper `resolveDmRelaySelection()` and
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by `NostrClient.sendDirectMessage()` when `useNip17` is enabled.
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### Legacy NIP-04 relay selection
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When privacy mode is disabled, bitvid sends a traditional kind `4` DM:
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- It attempts to load the recipient's NIP-65 relay list (`kind:10002`) from the
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configured read relays.
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- If no relay list is available, it falls back to the configured write relays
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(or the default relay list).
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The final relay set is where the signed NIP-04 ciphertext is published.
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## User controls that affect privacy
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### Privacy toggle (NIP-17 vs NIP-04)
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The DM composer exposes a privacy toggle that switches between NIP-04 and
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NIP-17 delivery. When the toggle is enabled, the UI explains that NIP-17
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gift-wraps the message so relays only see the wrapper and relay hints.
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### Relay hint management
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Users can curate their own DM relay hints list in the profile modal. The UI
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lets them add and remove WSS relay URLs and publish the resulting list as a
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`kind:10050` event. This list is what other clients query during the relay
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selection phase above.
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### Read receipts & typing indicators
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Additional DM privacy toggles (read receipts and typing indicators) live in the
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same profile modal and persist to local state. Turning them off reduces
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metadata leaks by preventing extra ephemeral events from being sent.
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