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Per NIP-17 §Publishing, gift wraps MUST only be published to the relays
advertised in the recipient's kind:10050. Today three send paths in
DesktopIAccount fall through to relayManager.connectedRelays.value
when the recipient has no kind:10050 cached:
sendNip17PrivateMessage (line 200)
sendNip17EncryptedFile (line 231)
sendGiftWraps (line 253)
This is the security-review F-04 metadata leak: at best the wrap never
reaches the recipient (their other clients don't read those relays);
at worst the recipient pubkey + send timestamp leak to general/feed
relays outside their chosen inbox. Same class of bug as the relay-
power-tools work explicitly closed for the relay picker on
2026-04-20 ("block DM fallback to all relays — metadata leak").
Replace the fallback with strict resolution: if the recipient has no
kind:10050 in the cache, return an empty target set. DmSendTracker
already handles total relay count == 0 with a "No relays available"
failure state, so the user gets a visible error instead of a silent
leak.
Indexer fan-out + a UI dialog for the missing-10050 case is the
permanent fix, scoped to Phase 4 (DmInboxRelayResolver). This commit
is the conservative pre-Phase-4 plug — better to fail visibly than
leak silently.
NIP-04 send is unchanged: that path is pre-NIP-17, the encrypted
content sits next to other public events on the sender's outbox by
design.