diff --git a/warzone/CLAUDE.md b/warzone/CLAUDE.md
index 5b982e8..0a3c885 100644
--- a/warzone/CLAUDE.md
+++ b/warzone/CLAUDE.md
@@ -1,5 +1,15 @@
 # featherChat — Design Principles & Conventions
 
+## MANDATORY: Version Bumping
+
+**After every set of changes that modifies functionality, bump the version:**
+1. `Cargo.toml` workspace version (e.g. `0.0.22` → `0.0.23`)
+2. `crates/warzone-protocol/Cargo.toml` standalone version (same)
+3. `crates/warzone-server/src/routes/web.rs` JS `VERSION` constant
+4. `crates/warzone-server/src/routes/web.rs` service worker `CACHE` version (`wz-vN` → `wz-v(N+1)`)
+
+Never commit functional changes without bumping all four. The service worker cache MUST be bumped or browsers will serve stale WASM.
+
 ## Architecture Principles
 
 1. **Single seed, multiple identities** — Ed25519 (messaging), X25519 (encryption), secp256k1 (ETH address) all derived from one BIP39 seed via HKDF with domain-separated info strings.
diff --git a/warzone/Cargo.lock b/warzone/Cargo.lock
index f2bd0a8..27cffb7 100644
--- a/warzone/Cargo.lock
+++ b/warzone/Cargo.lock
@@ -2956,7 +2956,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-client"
-version = "0.0.21"
+version = "0.0.22"
 dependencies = [
  "anyhow",
  "argon2",
@@ -2989,7 +2989,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-mule"
-version = "0.0.21"
+version = "0.0.22"
 dependencies = [
  "anyhow",
  "clap",
@@ -2998,7 +2998,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-protocol"
-version = "0.0.21"
+version = "0.0.22"
 dependencies = [
  "base64",
  "bincode",
@@ -3023,7 +3023,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-server"
-version = "0.0.21"
+version = "0.0.22"
 dependencies = [
  "anyhow",
  "axum",
@@ -3053,7 +3053,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-wasm"
-version = "0.0.21"
+version = "0.0.22"
 dependencies = [
  "base64",
  "bincode",
diff --git a/warzone/Cargo.toml b/warzone/Cargo.toml
index da33c53..132b47a 100644
--- a/warzone/Cargo.toml
+++ b/warzone/Cargo.toml
@@ -9,7 +9,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.0.21"
+version = "0.0.22"
 edition = "2021"
 license = "MIT"
 rust-version = "1.75"
diff --git a/warzone/crates/warzone-protocol/Cargo.toml b/warzone/crates/warzone-protocol/Cargo.toml
index 5a525de..b118c06 100644
--- a/warzone/crates/warzone-protocol/Cargo.toml
+++ b/warzone/crates/warzone-protocol/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "warzone-protocol"
-version = "0.0.21"
+version = "0.0.22"
 edition = "2021"
 license = "MIT"
 description = "Core crypto & wire protocol for featherChat (Warzone messenger)"
diff --git a/warzone/crates/warzone-server/src/routes/web.rs b/warzone/crates/warzone-server/src/routes/web.rs
index 9b775b2..5ee6af0 100644
--- a/warzone/crates/warzone-server/src/routes/web.rs
+++ b/warzone/crates/warzone-server/src/routes/web.rs
@@ -50,7 +50,7 @@ async fn pwa_manifest() -> impl IntoResponse {
 
 async fn service_worker() -> impl IntoResponse {
     ([(header::CONTENT_TYPE, "application/javascript")], r##"
-const CACHE = 'wz-v2';
+const CACHE = 'wz-v3';
 const SHELL = ['/', '/wasm/warzone_wasm.js', '/wasm/warzone_wasm_bg.wasm', '/icon.svg', '/manifest.json'];
 
 self.addEventListener('install', e => {
@@ -242,7 +242,7 @@ let pollTimer = null;
 let ws = null;  // WebSocket connection
 let wasmReady = false;
 
-const VERSION = '0.0.17';
+const VERSION = '0.0.22';
 let DEBUG = true;  // toggle with /debug command
 
 // ── Receipt tracking ──
@@ -388,11 +388,12 @@ function loadSavedIdentity() {
 async function registerKey() {
   const fp = normFP(myFingerprint);
   const bundleBytes = wasmIdentity.bundle_bytes();
-  dbg('Registering key, fp:', fp, 'bundle size:', bundleBytes.length);
+  myEthAddress = wasmIdentity.eth_address();
+  dbg('Registering key, fp:', fp, 'bundle size:', bundleBytes.length, 'eth:', myEthAddress);
   await fetch(SERVER + '/v1/keys/register', {
     method: 'POST',
     headers: { 'Content-Type': 'application/json' },
-    body: JSON.stringify({ fingerprint: fp, bundle: Array.from(bundleBytes) })
+    body: JSON.stringify({ fingerprint: fp, bundle: Array.from(bundleBytes), eth_address: myEthAddress })
   });
   dbg('Key registered');
 }
@@ -862,20 +863,14 @@ async function enterChat() {
   document.getElementById('hdr-server').textContent = SERVER;
 
   await registerKey();
-  addSys('Identity loaded: ' + myFingerprint);
+  addSys('Identity: ' + myEthAddress);
+  addSys('Fingerprint: ' + myFingerprint);
   addSys('Key registered with server');
 
-  // Fetch ETH address from server
-  try {
-    const resolveResp = await fetch(SERVER + '/v1/resolve/' + normFP(myFingerprint));
-    const resolveData = await resolveResp.json();
-    if (resolveData.eth_address) {
-      myEthAddress = resolveData.eth_address;
-      addSys('ETH: ' + myEthAddress);
-      document.getElementById('hdr-eth').textContent = myEthAddress.slice(0, 10) + '...';
-      document.getElementById('hdr-eth').title = myEthAddress;
-    }
-  } catch(e) { dbg('ETH resolve failed:', e); }
+  if (myEthAddress) {
+    document.getElementById('hdr-eth').textContent = myEthAddress.slice(0, 10) + '...';
+    document.getElementById('hdr-eth').title = myEthAddress;
+  }
 
   addSys('v' + VERSION + ' | DM: paste peer fingerprint or @alias above');
   addSys('/alias · /g · /gleave · /gkick · /gmembers · /glist · /friend · /file · /info');
diff --git a/warzone/crates/warzone-wasm/src/lib.rs b/warzone/crates/warzone-wasm/src/lib.rs
index 879393d..0c84ae4 100644
--- a/warzone/crates/warzone-wasm/src/lib.rs
+++ b/warzone/crates/warzone-wasm/src/lib.rs
@@ -52,6 +52,12 @@ impl WasmIdentity {
         Seed::from_bytes(self.seed_bytes).to_mnemonic()
     }
 
+    /// Get the Ethereum address derived from this seed.
+    pub fn eth_address(&self) -> String {
+        let eth = warzone_protocol::ethereum::derive_eth_identity(&self.seed_bytes);
+        eth.address.to_checksum()
+    }
+
     /// Get the pre-key bundle as bincode bytes (for server registration).
     /// The bundle is generated once and cached. The SPK secret is stored internally.
     pub fn bundle_bytes(&mut self) -> Result<Vec<u8>, JsValue> {