fix(server): web UI listens on IPv6 — the mesh could never load it

The mesh is IPv6-only; the main web listener bound 0.0.0.0 only, so a
phone reaching a node over its fips0 ULA got RST on :80
(ERR_CONNECTION_ABORTED) — UI over mesh was structurally impossible.
Confirmed 2026-07-26 on framework-pt: v4:80 = 200, v6:80 = refused.
Mirror an IPv4-any main listener with a V6ONLY [::] socket on the same
port; V6ONLY so it coexists with the v4 listener regardless of
net.ipv6.bindv6only.

Also: fips.yaml generator carries the fast-reconnect profile (validated
live on framework-pt since 2026-07-24; snapshot tests updated).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Android/COMPANION_RELEASE.md

@@ -23,6 +23,10 @@ used by the `.githooks/pre-push` hook), which:
    **aborts** if any is missing.
 5. Stages the signed APK at `neode-ui/public/packages/archipelago-companion.apk`,
    commits, and pushes with `SHIP_COMPANION=1` (the sanctioned pre-push bypass).
+6. The first-launch companion modal and Android "Share this app" QR point at
+   `http://146.59.87.168:2100/packages/archipelago-companion.apk`. After the
+   repo artifact is built, mirror that exact APK to the VPS2-served path before
+   calling the release done.
 
 **Never** hand-roll `gradlew assembleDebug` + `cp` to the served path. That path
 skips the clean build and the signature enforcement and is exactly how a broken
@@ -82,13 +86,16 @@ home-screen app layouts wiped by an over-broad action.
 
 ## Verify the published download after shipping
 
-The download served to nodes is Gitea raw-on-main. Confirm the live bytes match
-what you built and signed:
+The checked-in artifact is Gitea raw-on-main. The QR/App Store download served
+to users is the VPS2 `:2100` URL. Confirm both live byte streams match what you
+built and signed:
 
 ```bash
 SERVED=neode-ui/public/packages/archipelago-companion.apk
-URL=http://146.59.87.168:3000/lfg2025/archy/raw/branch/main/$SERVED
-curl -sS -o /tmp/live.apk "$URL"
-shasum -a 256 "$SERVED" /tmp/live.apk          # must match
-apksigner verify -v --min-sdk-version 21 /tmp/live.apk | grep -i "scheme"  # v1/v2/v3 = true
+GITEA_URL=http://146.59.87.168:3000/lfg2025/archy/raw/branch/main/$SERVED
+QR_URL=http://146.59.87.168:2100/packages/archipelago-companion.apk
+curl -sS -o /tmp/live-gitea.apk "$GITEA_URL"
+curl -sS -o /tmp/live-qr.apk "$QR_URL"
+shasum -a 256 "$SERVED" /tmp/live-gitea.apk /tmp/live-qr.apk  # all must match
+apksigner verify -v --min-sdk-version 21 /tmp/live-qr.apk | grep -i "scheme"  # v1/v2/v3 = true
 ```

Android/app/build.gradle.kts

@@ -11,8 +11,8 @@ android {
         applicationId = "com.archipelago.app"
         minSdk = 26
         targetSdk = 35
-        versionCode = 31
-        versionName = "0.5.11"
+        versionCode = 38
+        versionName = "0.5.18"
 
         vectorDrawables {
             useSupportLibrary = true

Android/app/src/main/java/com/archipelago/app/data/ServerQrParser.kt

@@ -88,8 +88,18 @@ object ServerQrParser {
 
     private fun parseFips(uri: Uri): FipsPairInfo? {
         val npub = uri.getQueryParameter("fnpub")?.trim()
-        val host = uri.getQueryParameter("fhost")?.trim()
+        var host = uri.getQueryParameter("fhost")?.trim()
         if (npub.isNullOrBlank() || host.isNullOrBlank()) return null
+        // A .fips fhost is a dead dial hint: Android's system DNS can't
+        // resolve .fips, so every handshake send fails and first connect
+        // falls back to slow anchor discovery. If the QR's `url` host is a
+        // real address, dial that instead (QRs minted while the node UI was
+        // browsed over the mesh carry npub….fips here).
+        if (host.endsWith(".fips")) {
+            val urlHost = uri.getQueryParameter("url")
+                ?.let { runCatching { Uri.parse(it).host }.getOrNull() }
+            if (!urlHost.isNullOrBlank() && !urlHost.endsWith(".fips")) host = urlHost
+        }
         return FipsPairInfo(
             npub = npub,
             ula = uri.getQueryParameter("fip")?.trim().orEmpty(),

Android/app/src/main/java/com/archipelago/app/fips/FipsPreferences.kt

@@ -25,6 +25,26 @@ internal const val ARCHY_ANCHOR_NPUB =
 internal const val ARCHY_ANCHOR_ADDR = "146.59.87.168:8444"
 internal const val ARCHY_ANCHOR_TRANSPORT = "tcp"
 
+/**
+ * Public FIPS network anchors (join.fips.network — the dual-transport TCP
+ * pair; keep in lockstep with core/archipelago/src/fips/anchors.rs
+ * fips_network_anchors()). Baked into every pairing at trailing priority so
+ * a degraded/unreachable vps2 anchor can never strand the phone: the mesh
+ * still joins the public tree and routes to the node through it.
+ */
+internal val PUBLIC_FIPS_ANCHORS = listOf(
+    Triple(
+        "npub10yffd020a4ag8zcy75f9pruq3rnghvvhd5hphl9s62zgp35s560qrksp9u",
+        "23.182.128.74:443",
+        "tcp",
+    ),
+    Triple(
+        "npub1qmc3cvfz0yu2hx96nq3gp55zdan2qclealn7xshgr448d3nh6lks7zel98",
+        "217.77.8.91:443",
+        "tcp",
+    ),
+)
+
 /**
  * Mesh identity + known node peers. Follows the same plaintext-DataStore
  * storage model as ServerPreferences (the server password lives there the
@@ -126,7 +146,7 @@ class FipsPreferences(private val context: Context) {
             if (peer.ip.isBlank() || peer.port <= 0) continue
             merged.put(JSONObject().apply {
                 put("npub", peer.npub)
-                put("alias", peer.name.ifBlank { "Party phone" })
+                put("alias", hostSafeAlias(peer.name.ifBlank { "party-phone" }))
                 put("addresses", JSONArray().put(JSONObject().apply {
                     put("transport", "udp")
                     put("addr", "${peer.ip}:${peer.port}")
@@ -145,7 +165,7 @@ class FipsPreferences(private val context: Context) {
         ) {
             merged.put(JSONObject().apply {
                 put("npub", ARCHY_ANCHOR_NPUB)
-                put("alias", "Archipelago anchor")
+                put("alias", "archipelago-anchor")
                 put("addresses", JSONArray().put(JSONObject().apply {
                     put("transport", ARCHY_ANCHOR_TRANSPORT)
                     put("addr", ARCHY_ANCHOR_ADDR)
@@ -153,9 +173,40 @@ class FipsPreferences(private val context: Context) {
                 }))
             })
         }
+        // Backfill anchor peers for entries paired before newer QR/app
+        // releases added them. `upsertNodePeer` persists these on re-scan, but
+        // startup must also self-heal old DataStore state so updating the APK is
+        // enough to get off-LAN redundancy.
+        if (merged.length() > 0) {
+            addAnchorIfMissing(merged, ARCHY_ANCHOR_NPUB, "archipelago-anchor", ARCHY_ANCHOR_ADDR, ARCHY_ANCHOR_TRANSPORT, 40)
+            for ((i, anchor) in PUBLIC_FIPS_ANCHORS.withIndex()) {
+                val (npub, addr, transport) = anchor
+                addAnchorIfMissing(merged, npub, "fips-network-anchor-${i + 1}", addr, transport, 50 + i * 10)
+            }
+        }
         return merged.toString()
     }
 
+    private fun addAnchorIfMissing(
+        peers: JSONArray,
+        npub: String,
+        alias: String,
+        addr: String,
+        transport: String,
+        priority: Int,
+    ) {
+        if ((0 until peers.length()).any { peers.optJSONObject(it)?.optString("npub") == npub }) return
+        peers.put(JSONObject().apply {
+            put("npub", npub)
+            put("alias", alias)
+            put("addresses", JSONArray().put(JSONObject().apply {
+                put("transport", transport)
+                put("addr", addr)
+                put("priority", priority)
+            }))
+        })
+    }
+
     private fun parsePartyPeers(json: String): List<PartyPeer> = try {
         val arr = JSONArray(json)
         (0 until arr.length()).mapNotNull { i ->
@@ -200,16 +251,19 @@ class FipsPreferences(private val context: Context) {
         val incoming = mutableListOf<JSONObject>()
         incoming += JSONObject().apply {
             put("npub", info.npub)
-            put("alias", alias.ifBlank { "Archipelago" })
+            put("alias", hostSafeAlias(alias.ifBlank { "Archipelago" }))
             val addresses = JSONArray()
-            if (info.udpPort > 0) {
+            // .fips hosts are unresolvable on Android (no system .fips DNS):
+            // storing one gives the mesh a dial target that fails every
+            // handshake and stalls first connect on anchor discovery.
+            if (info.udpPort > 0 && !info.host.endsWith(".fips")) {
                 addresses.put(JSONObject().apply {
                     put("transport", "udp")
                     put("addr", "${info.host}:${info.udpPort}")
                     put("priority", 10)
                 })
             }
-            if (info.tcpPort > 0) {
+            if (info.tcpPort > 0 && !info.host.endsWith(".fips")) {
                 addresses.put(JSONObject().apply {
                     put("transport", "tcp")
                     put("addr", "${info.host}:${info.tcpPort}")
@@ -220,9 +274,10 @@ class FipsPreferences(private val context: Context) {
         }
         for (anchor in info.anchors) {
             if (anchor.npub == info.npub) continue
+            if (anchor.addr.substringBeforeLast(":").endsWith(".fips")) continue
             incoming += JSONObject().apply {
                 put("npub", anchor.npub)
-                put("alias", "Mesh anchor")
+                put("alias", "mesh-anchor")
                 put("addresses", JSONArray().put(JSONObject().apply {
                     put("transport", anchor.transport)
                     put("addr", anchor.addr)
@@ -237,7 +292,7 @@ class FipsPreferences(private val context: Context) {
         ) {
             incoming += JSONObject().apply {
                 put("npub", ARCHY_ANCHOR_NPUB)
-                put("alias", "Archipelago anchor")
+                put("alias", "archipelago-anchor")
                 put("addresses", JSONArray().put(JSONObject().apply {
                     put("transport", ARCHY_ANCHOR_TRANSPORT)
                     put("addr", ARCHY_ANCHOR_ADDR)
@@ -245,6 +300,21 @@ class FipsPreferences(private val context: Context) {
                 }))
             }
         }
+        // And the public FIPS network anchors at trailing priority, so one
+        // degraded rendezvous (vps2, 2026-07-24) can never strand the phone.
+        for ((i, anchor) in PUBLIC_FIPS_ANCHORS.withIndex()) {
+            val (npub, addr, transport) = anchor
+            if (info.npub == npub || incoming.any { it.optString("npub") == npub }) continue
+            incoming += JSONObject().apply {
+                put("npub", npub)
+                put("alias", "fips-network-anchor-${i + 1}")
+                put("addresses", JSONArray().put(JSONObject().apply {
+                    put("transport", transport)
+                    put("addr", addr)
+                    put("priority", 50 + i * 10)
+                }))
+            }
+        }
         val incomingNpubs = incoming.map { it.optString("npub") }.toSet()
         context.fipsDataStore.edit { prefs ->
             val current = JSONArray(prefs[peersKey] ?: "[]")
@@ -258,3 +328,14 @@ class FipsPreferences(private val context: Context) {
         }
     }
 }
+
+/**
+ * Peer aliases feed the fips host map as `<alias>.fips` hostnames; anything
+ * that isn't a valid DNS label ("Framework PT" — the space) gets rejected and
+ * silently drops the peer from name resolution. Slug it instead of losing it.
+ */
+internal fun hostSafeAlias(alias: String): String =
+    alias.lowercase()
+        .replace(Regex("[^a-z0-9.-]+"), "-")
+        .trim('-', '.')
+        .ifBlank { "archipelago" }

Android/rust/archy-fips-core/Cargo.lock

@@ -464,7 +464,7 @@ checksum = "5baebc0774151f905a1a2cc41989300b1e6fbb29aff0ceffa1064fdd3088d582"
 [[package]]
 name = "fips"
 version = "0.3.0-dev"
-source = "git+https://github.com/9qeklajc/fips-native?rev=46494a74fc85b878305d275d42ab719082b06ba6#46494a74fc85b878305d275d42ab719082b06ba6"
+source = "git+https://github.com/Zazawowow/fips-native?rev=07d21d4482be56b14295d2525e41f8386d1bfe6f#07d21d4482be56b14295d2525e41f8386d1bfe6f"
 dependencies = [
  "bech32",
  "chacha20poly1305",

Android/rust/archy-fips-core/Cargo.toml

@@ -23,7 +23,10 @@ crate-type = ["lib", "cdylib"]
 
 [dependencies]
 # default-features drops the ratatui TUI; tun-support enables Node::start_with_tun_fd.
-fips = { git = "https://github.com/9qeklajc/fips-native", rev = "46494a74fc85b878305d275d42ab719082b06ba6", default-features = false, features = ["tun-support"] }
+# Zazawowow/fips-native `fast-join-pinned` = upstream pinned rev 46494a74 +
+# discovery re-fire on topology change (fresh 5G join: first route no longer
+# waits out doomed pre-join lookups). Upstream 9qeklajc denies pushes.
+fips = { git = "https://github.com/Zazawowow/fips-native", rev = "07d21d4482be56b14295d2525e41f8386d1bfe6f", default-features = false, features = ["tun-support"] }
 anyhow = "1.0"
 serde_json = "1.0"
 hex = "0.4"

Android/rust/archy-fips-core/src/mesh.rs

@@ -85,6 +85,27 @@ pub fn build_config(secret: &str, peers: Vec<PeerConfig>, listen_port: u16) -> C
     });
     // TCP with no bind_addr = outbound-only (fallback when UDP is blocked).
     cfg.transports.tcp = TransportInstances::Single(Default::default());
+    // Fast-connect profile — a phone opens the app and expects the node NOW.
+    // Stock pacing is tuned for always-on routers: a failed discovery backs
+    // off 30s, session resends gap out to 8-16s, dead links redial at
+    // 5s→300s. Over 5G that stacked into a ~40s first connect (observed
+    // 2026-07-24: anchor +10s, session +40s). Retries only fire while a
+    // link/session is down, so steady-state traffic is unchanged.
+    cfg.node.retry.base_interval_secs = 1; // dead-link redial 1s,2s,4s…
+    cfg.node.retry.max_backoff_secs = 30; // …capped at 30s, not 5 min
+    cfg.node.retry.max_retries = 30;
+    cfg.node.rate_limit.handshake_resend_interval_ms = 400;
+    cfg.node.rate_limit.handshake_resend_backoff = 1.5;
+    cfg.node.rate_limit.handshake_max_resends = 10;
+    cfg.node.discovery.backoff_base_secs = 1; // failed lookup retries fast
+    cfg.node.discovery.backoff_max_secs = 30;
+    cfg.node.discovery.retry_interval_secs = 2;
+    cfg.node.discovery.max_attempts = 3;
+    // Lookups launched before the tree position settles are doomed; a 10s
+    // completion timeout made each one cost 10s before the 1s retry could
+    // fire (observed: 19s to a route on a fresh join). Fail fast instead —
+    // the resend-within-window above still gives each attempt two shots.
+    cfg.node.discovery.timeout_secs = 5;
     cfg.peers = peers;
     cfg
 }

core/archipelago/src/fips/anchors.rs

@@ -156,7 +156,24 @@ pub async fn load(data_dir: &Path) -> Result<Vec<SeedAnchor>> {
         .with_context(|| format!("read {}", path.display()))?;
     let anchors: Vec<SeedAnchor> =
         serde_json::from_slice(&bytes).with_context(|| format!("parse {}", path.display()))?;
-    Ok(anchors)
+    Ok(repair_legacy_anchor_set(anchors))
+}
+
+/// Add the newer redundant public TCP anchors to legacy files that only carry
+/// the Archipelago-operated vps2 anchor. A deliberately custom/private anchor
+/// list remains authoritative; this only repairs the exact stale shape shipped
+/// before the join.fips.network anchors became defaults.
+fn repair_legacy_anchor_set(mut anchors: Vec<SeedAnchor>) -> Vec<SeedAnchor> {
+    let has_archy = anchors.iter().any(|a| a.npub == ARCHY_ANCHOR_NPUB);
+    let has_fips_network = fips_network_anchors()
+        .iter()
+        .any(|default| anchors.iter().any(|a| a.npub == default.npub));
+    if has_archy && !has_fips_network {
+        for anchor in fips_network_anchors() {
+            anchors.push(anchor);
+        }
+    }
+    anchors
 }
 
 /// Persist the list. Overwrites atomically via write-then-rename so a
@@ -338,6 +355,30 @@ mod tests {
         assert!(got.iter().all(|a| a.transport == "tcp"));
     }
 
+    #[tokio::test]
+    async fn load_repairs_legacy_archy_only_anchor_file() {
+        let dir = tempfile::tempdir().unwrap();
+        save(dir.path(), &[archy_anchor()]).await.unwrap();
+
+        let got = load(dir.path()).await.unwrap();
+        assert!(got.iter().any(|a| a.npub == ARCHY_ANCHOR_NPUB));
+        for anchor in fips_network_anchors() {
+            assert!(got.iter().any(|a| a.npub == anchor.npub));
+        }
+    }
+
+    #[tokio::test]
+    async fn load_keeps_private_anchor_file_authoritative() {
+        let dir = tempfile::tempdir().unwrap();
+        let private = mk("npub1private");
+        save(dir.path(), std::slice::from_ref(&private))
+            .await
+            .unwrap();
+
+        let got = load(dir.path()).await.unwrap();
+        assert_eq!(got, vec![private]);
+    }
+
     #[tokio::test]
     async fn removing_one_default_persists_and_keeps_the_other() {
         // Editing the anchor list (here removing one default) makes the file

core/archipelago/src/fips/config.rs

@@ -48,6 +48,30 @@ pub struct FipsConfig {
 pub struct NodeSection {
     pub identity: IdentitySection,
     pub discovery: DiscoverySection,
+    pub retry: RetrySection,
+    pub rate_limit: RateLimitSection,
+}
+
+/// Fast-reconnect profile (`node.retry.*`). Upstream defaults (5s base
+/// doubling to 300s) are tuned for stable always-on links; a node redialing
+/// a recycled anchor sat off-mesh for ~90s. Field names verified live on
+/// 2026-07-24: a daemon restarted with these keys in fips.yaml and peered.
+#[derive(Debug, Clone, PartialEq, Serialize)]
+pub struct RetrySection {
+    pub base_interval_secs: u64,
+    pub max_backoff_secs: u64,
+    pub max_retries: u32,
+}
+
+/// Session-handshake resend pacing (`node.rate_limit.*`). Stock 1s x2.0
+/// gaps out to 8-16s between resends exactly when a route has just
+/// appeared; 400ms x1.5 keeps continuous coverage through the connect
+/// window (phone measured session-after-route: 225ms).
+#[derive(Debug, Clone, PartialEq, Serialize)]
+pub struct RateLimitSection {
+    pub handshake_resend_interval_ms: u64,
+    pub handshake_resend_backoff: f64,
+    pub handshake_max_resends: u32,
 }
 
 #[derive(Debug, Clone, PartialEq, Serialize)]
@@ -60,6 +84,14 @@ pub struct IdentitySection {
 
 #[derive(Debug, Clone, PartialEq, Serialize)]
 pub struct DiscoverySection {
+    /// Lookup completion timeout. Lookups fired while the tree position is
+    /// still settling are doomed; failing them fast (5s, not 10s) lets the
+    /// 1s-backoff retry find the route the moment it exists.
+    pub timeout_secs: u64,
+    pub backoff_base_secs: u64,
+    pub backoff_max_secs: u64,
+    pub retry_interval_secs: u64,
+    pub max_attempts: u8,
     pub lan: LanDiscoverySection,
 }
 
@@ -123,8 +155,23 @@ impl Default for FipsConfig {
             node: NodeSection {
                 identity: IdentitySection { persistent: true },
                 discovery: DiscoverySection {
+                    timeout_secs: 5,
+                    backoff_base_secs: 1,
+                    backoff_max_secs: 30,
+                    retry_interval_secs: 2,
+                    max_attempts: 3,
                     lan: LanDiscoverySection { enabled: true },
                 },
+                retry: RetrySection {
+                    base_interval_secs: 1,
+                    max_backoff_secs: 30,
+                    max_retries: 30,
+                },
+                rate_limit: RateLimitSection {
+                    handshake_resend_interval_ms: 400,
+                    handshake_resend_backoff: 1.5,
+                    handshake_max_resends: 10,
+                },
             },
             tun: TunSection {
                 enabled: true,
@@ -318,8 +365,21 @@ node:
   identity:
     persistent: true
   discovery:
+    timeout_secs: 5
+    backoff_base_secs: 1
+    backoff_max_secs: 30
+    retry_interval_secs: 2
+    max_attempts: 3
     lan:
       enabled: true
+  retry:
+    base_interval_secs: 1
+    max_backoff_secs: 30
+    max_retries: 30
+  rate_limit:
+    handshake_resend_interval_ms: 400
+    handshake_resend_backoff: 1.5
+    handshake_max_resends: 10
 tun:
   enabled: true
   name: fips0

core/archipelago/src/fips/service.rs

@@ -81,6 +81,7 @@ async fn sudo_systemctl(verb: &str, unit: &str) -> Result<()> {
 /// Unmask + start + enable the FIPS service. Idempotent — safe to call
 /// on every backend startup once the key is on disk.
 pub async fn activate(unit: &str) -> Result<()> {
+    kill_stale_daemons().await?;
     // Order matters: unmask before enable/start, otherwise enable fails
     // on a masked unit.
     sudo_systemctl("unmask", unit).await?;
@@ -94,9 +95,42 @@ pub async fn stop(unit: &str) -> Result<()> {
 }
 
 pub async fn restart(unit: &str) -> Result<()> {
+    kill_stale_daemons().await?;
     sudo_systemctl("restart", unit).await
 }
 
+/// Kill orphaned `fips` processes not owned by either known systemd unit.
+///
+/// Field failure, 2026-07-24: a stale daemon survived outside systemd and kept
+/// `0.0.0.0:8443` bound. The supervised daemon then started UDP-only, so every
+/// TCP seed-anchor connect failed with "no operational transport" and phones
+/// on 5G could not discover the node. We keep the cleanup narrow: preserve the
+/// MainPID of both units and terminate only extra `pgrep -x fips` matches.
+pub async fn kill_stale_daemons() -> Result<()> {
+    let script = format!(
+        r#"keep="$(systemctl show -p MainPID --value {managed} 2>/dev/null; systemctl show -p MainPID --value {upstream} 2>/dev/null)"
+for pid in $(pgrep -x fips 2>/dev/null || true); do
+  case " $keep " in
+    *" $pid "*) ;;
+    *) kill "$pid" 2>/dev/null || true ;;
+  esac
+done
+"#,
+        managed = super::SERVICE_UNIT,
+        upstream = super::UPSTREAM_SERVICE_UNIT,
+    );
+    let out = Command::new("sudo")
+        .args(["sh", "-c", &script])
+        .output()
+        .await
+        .context("sudo stale fips cleanup failed to launch")?;
+    if !out.status.success() {
+        let stderr = String::from_utf8_lossy(&out.stderr).trim().to_string();
+        anyhow::bail!("stale fips cleanup failed: {}", stderr);
+    }
+    Ok(())
+}
+
 /// Resolve which systemd unit is actually supervising the fips daemon
 /// on this host. Nodes installed from the archipelago ISO run
 /// `archipelago-fips.service`; nodes that were apt-installed (or had

core/archipelago/src/server.rs

@@ -988,6 +988,43 @@ impl Server {
             main_addr,
         ));
 
+        // The mesh is IPv6-only: a phone reaching the node over its fips0
+        // ULA lands on port 80 over v6, where a 0.0.0.0 listener never
+        // answers — the UI was structurally unreachable over the mesh
+        // (RST -> ERR_CONNECTION_ABORTED, confirmed 2026-07-26: v4:80 = 200,
+        // v6:80 = refused). Mirror an IPv4-any main listener with a
+        // V6ONLY [::] socket on the same port — v6-only so it coexists
+        // with the v4 listener regardless of net.ipv6.bindv6only.
+        let v4_any_port = match main_addr {
+            SocketAddr::V4(v4) if v4.ip().is_unspecified() => Some(v4.port()),
+            _ => None,
+        };
+        let v6_task = if let Some(port) = v4_any_port {
+            let v6_addr = SocketAddr::new(
+                std::net::IpAddr::V6(std::net::Ipv6Addr::UNSPECIFIED),
+                port,
+            );
+            match bind_v6_only(v6_addr) {
+                Ok(listener) => {
+                    info!("IPv6 web listener bound {} (mesh ULA reachable)", v6_addr);
+                    Some(tokio::spawn(accept_loop(
+                        self.api_handler.clone(),
+                        listener,
+                        active_connections.clone(),
+                        false, // same semantics as the main listener
+                        tx.subscribe(),
+                        v6_addr,
+                    )))
+                }
+                Err(e) => {
+                    warn!("IPv6 web listener bind {} failed: {} — UI stays v4-only", v6_addr, e);
+                    None
+                }
+            }
+        } else {
+            None
+        };
+
         // Peer listener: late-binding so we don't need an archipelago
         // restart when fips0 comes up after onboarding.
         let peer_task = tokio::spawn(peer_late_bind_loop(
@@ -1012,6 +1049,9 @@ impl Server {
         }
 
         let _ = main_task.await;
+        if let Some(t) = v6_task {
+            let _ = t.await;
+        }
         let _ = peer_task.await;
 
         info!("Shutdown complete");
@@ -1019,6 +1059,24 @@ impl Server {
     }
 }
 
+/// Bind a V6ONLY `[::]` TCP listener. V6ONLY is set explicitly so the
+/// socket never claims the IPv4 side (which the main listener owns) —
+/// without it, Linux hosts with `net.ipv6.bindv6only=0` would fail with
+/// EADDRINUSE.
+fn bind_v6_only(addr: SocketAddr) -> std::io::Result<tokio::net::TcpListener> {
+    let socket = socket2::Socket::new(
+        socket2::Domain::IPV6,
+        socket2::Type::STREAM,
+        Some(socket2::Protocol::TCP),
+    )?;
+    socket.set_only_v6(true)?;
+    socket.set_reuse_address(true)?;
+    socket.set_nonblocking(true)?;
+    socket.bind(&addr.into())?;
+    socket.listen(1024)?;
+    tokio::net::TcpListener::from_std(socket.into())
+}
+
 /// Poll every 30s for `fips0`'s ULA; when it appears, bind the peer
 /// listener and run the normal accept loop. If the bind fails (port
 /// already taken, permissions), log and keep retrying. Returns on

core/archipelago/src/wallet/ecash.rs

@@ -632,11 +632,30 @@ pub async fn send_token_at(data_dir: &Path, mint_url: &str, amount_sats: u64) ->
         // Mark original proofs as spent
         wallet.mark_spent(&indices);
 
-        // Separate send proofs from change proofs
-        let (send, change): (Vec<_>, Vec<_>) = swap_result
-            .new_proofs
-            .into_iter()
-            .partition(|p| send_denoms.contains(&p.amount));
+        // Separate send proofs from change proofs BY COUNT, not membership:
+        // partition(contains) put EVERY proof whose denomination appeared in
+        // send_denoms into the token — when change shared a denomination with
+        // the send (worst case: spending from a proof worth exactly 2× the
+        // amount, send [n] + change [n]), the change proofs rode along and the
+        // receiver was credited double. Consume exactly one proof per needed
+        // send denomination; everything else is change.
+        let mut send_needed = send_denoms.clone();
+        let mut send: Vec<Proof> = Vec::new();
+        let mut change: Vec<Proof> = Vec::new();
+        for p in swap_result.new_proofs {
+            if let Some(pos) = send_needed.iter().position(|&d| d == p.amount) {
+                send_needed.swap_remove(pos);
+                send.push(p);
+            } else {
+                change.push(p);
+            }
+        }
+        if !send_needed.is_empty() {
+            anyhow::bail!(
+                "Mint swap returned incomplete send denominations (missing {:?})",
+                send_needed
+            );
+        }
 
         // Add change proofs back to wallet
         if !change.is_empty() {

neode-ui/src/components/CompanionIntroOverlay.vue

@@ -150,7 +150,7 @@ const STORAGE_KEY = 'neode_companion_intro_seen'
 // exposes the release-server address.
 const DEFAULT_DOWNLOAD_URL = IS_DEMO
   ? `${window.location.origin}/packages/archipelago-companion.apk`
-  : 'http://146.59.87.168:3000/lfg2025/archy/raw/branch/main/neode-ui/public/packages/archipelago-companion.apk'
+  : 'http://146.59.87.168:2100/packages/archipelago-companion.apk'
 
 // Deep-link scheme the companion app registers; carries the server entry the
 // app should create (see docs/companion-pairing-qr.md for the contract).
@@ -267,12 +267,20 @@ function isTailnetIp(host: string): boolean {
  *   - a tailnet 100.x address (operator browsing over Tailscale — a scanned
  *     QR carried one of these on 2026-07-22 and the companion sat there
  *     dialing an IP the phone had no route to)
+ *   - a .fips name or mesh ULA (operator browsing over the mesh — a scanned
+ *     QR carried npub….fips as fhost on 2026-07-24; Android's system DNS
+ *     can't resolve .fips, so the phone's direct dial died and first
+ *     connect crawled through anchor discovery instead of the LAN)
  */
 async function resolveServerUrl(): Promise<string> {
   if (IS_DEMO) return DEMO_SERVER_URL
   const { hostname, origin } = window.location
   const phoneUnreachable =
-    hostname === 'localhost' || hostname === '127.0.0.1' || isTailnetIp(hostname)
+    hostname === 'localhost' ||
+    hostname === '127.0.0.1' ||
+    isTailnetIp(hostname) ||
+    hostname.endsWith('.fips') ||
+    hostname.includes(':') // IPv6 literal — the node's mesh ULA
   if (!phoneUnreachable) return origin
   try {
     const res = await rpcClient.call<{ mdns_hostname?: string; lan_ip?: string | null }>({