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docs(nostr): document #h requirement for live reaction subscriptions #3487

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tlongwell-block merged 2 commits into from
Aug 1, 2026
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docs(nostr): document #h requirement for live reaction subscriptions #3487

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docs(nostr): document #h requirement for live reaction subscriptions
Jul 29, 2026
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docs(nostr): qualify channel reaction subscription scope
Aug 1, 2026
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12 changes: 12 additions & 0 deletions NOSTR.md
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Original file line number Diff line number Diff line change
Expand Up @@ -163,6 +163,10 @@ nak req -k 9 --tag "h=<channel-uuid>" --stream \
nak event -k 7 -c "+" --tag "h=<channel-uuid>" --tag "e=<message-event-id>" \
--auth --sec <privkey> ws://localhost:3000

# Subscribe to reactions to channel messages — include #h for live delivery (see note below)
nak req -k 7 --tag "h=<channel-uuid>" --stream \
--auth --sec <privkey> ws://localhost:3000

# Delete a message (#h optional; #e required; must be self-authored)
nak event -k 5 -c "reason" --tag "h=<channel-uuid>" --tag "e=<message-event-id>" \
--auth --sec <privkey> ws://localhost:3000
Expand All @@ -185,6 +189,14 @@ nak req -k 1059 --tag "p=<your-hex-pubkey>" \
--auth --sec <privkey> ws://localhost:3000
```

> **Note:** The relay derives a reaction's channel from its `#e` target (client `#h` is
> ignored for channel determination). Reactions to channel-scoped events are therefore
> channel-scoped. Live fan-out keeps channel-scoped and global subscriptions strictly
> separate, which means a kinds-only subscription (`{"kinds":[7]}`) receives none of
> those reactions — subscribe with `{"kinds":[7],"#h":["<channel-uuid>"]}` instead.
> `#h` matching works whether or not the signed reaction carries an `h` tag: explicit
> `h` tags are matched directly, and tagless reactions match via their stored channel.

### Tested Clients (Direct)

| Client | Platform | Evidence | Notes |
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