Automatic relay discovery over Nostr + call-to-action

Relay operators announce their relay with -announcerelay=host:port; every node
discovers announced relays (kind 38502) and adds them to its failover list, so
volunteer relays join with no maintainer edit or approval. Anti-spam cap +
validation; relays are trustless (echan makes a bad relay unable to read/MITM).
README: automatic relay-volunteer guide, 'don't let the network die' section.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/nostr.h b/src/nostr.h
index 41e59df..b878db9 100644
--- a/src/nostr.h
+++ b/src/nostr.h
@@ -32,6 +32,12 @@ std::string BtfActiveRelay();
 // Record the relay this node just registered its service at (thread-safe).
 void BtfSetActiveRelay(const std::string& relay);
 
+// If set (via /announcerelay=host:port), this node announces that relay on
+// Nostr so other nodes discover it automatically -- no manual seed-list edit.
+extern std::string strBtfAnnounceRelay;
+// Every relay to try: curated seeds + relays discovered from Nostr announcements.
+std::vector<std::string> BtfAllRelays();
+
 // Copy this node's .btf identity (lazily loading or generating it): the x-only
 // pubkey (= the .btf address) and the x25519 secret for the end-to-end channel.
 bool BtfGetIdentity(unsigned char pubkey[32], unsigned char enc_sk[32]);