add bootstrap flow

crates/signed_nostr/src/backend.rs

@@ -2,12 +2,11 @@ use std::time::Duration;
 
 use anyhow::{Context, Result, anyhow};
 use nostr_gossip_memory::prelude::*;
-use nostr_sdk::prelude::*;
-
 #[cfg(not(target_arch = "wasm32"))]
 use nostr_lmdb::prelude::*;
 #[cfg(target_arch = "wasm32")]
 use nostr_memory::prelude::*;
+use nostr_sdk::prelude::*;
 
 use crate::signer::UniversalSigner;
 
@@ -51,6 +50,8 @@ impl NostrBackend {
             .gossip(NostrGossipMemory::unbounded())
             .gossip_config(GossipConfig::default().no_background_refresh())
             .connect_timeout(Duration::from_secs(10))
+            .verify_subscriptions(true)
+            .ban_relay_on_mismatch(true)
             .sleep_when_idle(SleepWhenIdle::Enabled {
                 timeout: Duration::from_secs(600),
             })
@@ -72,6 +73,16 @@ impl NostrBackend {
         Ok(())
     }
 
+    /// Add a relay used only for discovery (e.g. NIP-65 indexer relays).
+    /// No subscriptions or writes are routed through it.
+    pub async fn add_discovery_relay(&self, url: &str) -> Result<()> {
+        self.client
+            .add_relay(url)
+            .capabilities(RelayCapabilities::DISCOVERY)
+            .await?;
+        Ok(())
+    }
+
     pub async fn connect(&self) {
         self.client.connect().await;
     }