diff --git a/packages/core/src/dapp-relay.ts b/packages/core/src/dapp-relay.ts
index 9dc92ce..aa3b836 100644
--- a/packages/core/src/dapp-relay.ts
+++ b/packages/core/src/dapp-relay.ts
@@ -30,6 +30,7 @@ export interface DappRelayOptions {
   existingCredentials?: {
     privateKey: string;
     secret: string;
+    walletPublicKey: string;
   };
 }
 
@@ -104,6 +105,13 @@ export function initiateDappRelay(
   let keyExchanged = false;
   let walletPublicKeyNostr: Uint8Array | null = null;
 
+  if (options.existingCredentials) {
+    walletPublicKeyNostr = hexToBin(
+      options.existingCredentials.walletPublicKey,
+    );
+    keyExchanged = true;
+  }
+
   const wrappedCallback: RelayStatusCallback = (
     payload: RelayUpdatePayload,
   ) => {
diff --git a/packages/test-cli/src/cli.ts b/packages/test-cli/src/cli.ts
index 05e82e3..a96ce17 100644
--- a/packages/test-cli/src/cli.ts
+++ b/packages/test-cli/src/cli.ts
@@ -29,6 +29,10 @@ program
     "Existing dapp private key (64 hex chars) — for reconnection testing",
   )
   .option("--secret <hex>", "Existing secret (hex) — for reconnection testing")
+  .option(
+    "--wallet-public-key <hex>",
+    "Wallet's Nostr public key (hex) — for reconnection testing",
+  )
   .option(
     "--sign",
     "Send a dummy sign request after wallet is ready (tests approval flow)",
diff --git a/packages/test-cli/src/dapp.ts b/packages/test-cli/src/dapp.ts
index 8f19377..ca1ba40 100644
--- a/packages/test-cli/src/dapp.ts
+++ b/packages/test-cli/src/dapp.ts
@@ -180,6 +180,7 @@ export async function runDappMode(options: {
   relay: string;
   privateKey?: string;
   secret?: string;
+  walletPublicKey?: string;
   sign?: boolean;
 }): Promise<void> {
   const state = makeState();
@@ -217,8 +218,12 @@ export async function runDappMode(options: {
     {
       explicitRelayUrls: [options.relay],
       existingCredentials:
-        options.privateKey && options.secret
-          ? { privateKey: options.privateKey, secret: options.secret }
+        options.privateKey && options.secret && options.walletPublicKey
+          ? {
+              privateKey: options.privateKey,
+              secret: options.secret,
+              walletPublicKey: options.walletPublicKey,
+            }
           : undefined,
     },
   );
@@ -234,19 +239,11 @@ export async function runDappMode(options: {
         encodeURIComponent(dappRelay.uri),
     ),
   );
-  if (options.privateKey) {
-    console.log(
-      chalk.dim(
-        `\nReconnect:\n  wiz-test dapp --private-key ${options.privateKey} --secret ${dappRelay.credentials.secret}`,
-      ),
-    );
-  } else {
-    console.log(
-      chalk.dim(
-        `\nReconnect:\n  wiz-test dapp --private-key ${dappRelay.credentials.privateKey} --secret ${dappRelay.credentials.secret}`,
-      ),
-    );
-  }
+  console.log(
+    chalk.dim(
+      `\nReconnect (after key exchange):\n  wiz-test dapp --private-key ${options.privateKey ?? dappRelay.credentials.privateKey} --secret ${dappRelay.credentials.secret} --wallet-public-key <WALLET_PUBKEY>`,
+    ),
+  );
   console.log();
 
   const keySpinner = ora("Waiting for wallet to connect...").start();