diff --git a/native-apps/unity_ii_applink/README.md b/native-apps/unity_ii_applink/README.md
index 8880d7407..1c1fafe35 100644
--- a/native-apps/unity_ii_applink/README.md
+++ b/native-apps/unity_ii_applink/README.md
@@ -11,15 +11,22 @@ This is a Unity project with [ICP.NET](https://github.com/BoomDAO/ICP.NET) embed
 ## Workflow
 Before continuing, please read through the [Android App Links](https://developer.android.com/studio/write/app-link-indexing) to understand how Android App Links works.
 
-Here is the basic workflow that how to integrate with Internet Identity from a Unity Android game. The basic idea is to open the Web Browser from the game, login in with II in the browser, and pass the DelegationIdentity back to the game.
+Here is the basic workflow that how to integrate with Internet Identity from a Unity Android game. The basic idea is to open the Web Browser from the game, login in with II in the browser, and pass the `DelegationChain` back to the game.
 
 The steps in detail are described below:
 
 1. Set up an [Internet Identity integration dapp](#ii_integration_dapp) which supports logging in with II, with an `assetlinks.json` file associated.
    Please refer to [ii_integration_dapp](./ii_integration_dapp/README.md) to set up the dapp.
+
 2. Run a Unity game on Android, which is built from [android_integration sample](#unity_project).
    Please refer to [unity_project](./unity_project/README.md) to build the Unity Android game.
+
 3. Launch the Web Browser from the game to open the dapp frontend deployed in #1, with the public key of `Ed25519Identity` as a parameter.
+
 4. Login with your Internet Identity in the Web Browser.
-5. Launch the application via App Links, and pass the `DelegationIdentity` back to the game as the URL parameter.
-6. Call the backend canister with the `DelegationIdentity` to greet.
+
+5. Launch the application via App Links, and pass the `DelegationChain` back to the game as the URL parameter.
+
+6. Composite the `DelegationIdentity` with `DelegationChain` and the `Ed25519Identity`.
+
+7. Call the backend canister with the `DelegationIdentity` to greet.
diff --git a/native-apps/unity_ii_applink/ii_integration_dapp/README.md b/native-apps/unity_ii_applink/ii_integration_dapp/README.md
index 4592266ea..f16c221ba 100644
--- a/native-apps/unity_ii_applink/ii_integration_dapp/README.md
+++ b/native-apps/unity_ii_applink/ii_integration_dapp/README.md
@@ -4,13 +4,15 @@ This example derives from the [internet_identity_integration](https://github.com
 
 ## Overview
 
-This example shows a special case to support login with the `IncompleteEd25519KeyIdentity` which only contains the public key. The reason why we support this is all for security. 
+This example shows a use case to support login with the two delegations on the `DelegationChain`.
 
 As we described in [Internet Identity Integration](../README.md#workflow), users can log in with II from the game. Usually what they do is
 
 1. Generate the `Ed25519KeyIdentity` supported by [ICP.NET](https://github.com/BoomDAO/ICP.NET) in the Unity game.
-2. For security purposes, only pass the public key of the `Ed25519KeyIdentity` to the Web browser for login, this is where `IncompleteEd25519KeyIdentity` can be used for.
-3. In [index.js](./src/greet_frontend/src/index.js), we describe how to retrieve the public key of the `Ed25519Identity` from the URL parameter, use it to instantiate an `IncompleteEd25519KeyIdentity`, and log in with Internet Identity. 
+2. For security purposes, only pass the public key of the `Ed25519KeyIdentity` to the Web browser for login. And only the public key is necessary when creating a `DelegationChain`.
+3. In [index.js](./src/greet_frontend/src/index.js), we describe how to 
+    - log in with Internet Identity with the frontend generated session key
+    - retrieve the public key of the `Ed25519Identity` from the URL parameter and create another delegation with it. 
 
 With this, users don't need to pass the private key around, also they don't need to store the private key outside of the game as they can regenerate the key pairs for every session.
 
diff --git a/native-apps/unity_ii_applink/ii_integration_dapp/canister_ids.json b/native-apps/unity_ii_applink/ii_integration_dapp/canister_ids.json
new file mode 100644
index 000000000..6b0f9fa0c
--- /dev/null
+++ b/native-apps/unity_ii_applink/ii_integration_dapp/canister_ids.json
@@ -0,0 +1,8 @@
+{
+  "greet_backend": {
+    "ic": "72rj2-biaaa-aaaan-qdatq-cai"
+  },
+  "greet_frontend": {
+    "ic": "6x7nu-oaaaa-aaaan-qdaua-cai"
+  }
+}
\ No newline at end of file
diff --git a/native-apps/unity_ii_applink/ii_integration_dapp/src/greet_frontend/assets/.well-known/assetlinks.json b/native-apps/unity_ii_applink/ii_integration_dapp/src/greet_frontend/assets/.well-known/assetlinks.json
index 49a4f1c11..88d52e098 100644
--- a/native-apps/unity_ii_applink/ii_integration_dapp/src/greet_frontend/assets/.well-known/assetlinks.json
+++ b/native-apps/unity_ii_applink/ii_integration_dapp/src/greet_frontend/assets/.well-known/assetlinks.json
@@ -2,8 +2,8 @@
   "relation": ["delegate_permission/common.handle_all_urls"],
   "target": {
     "namespace": "android_app",
-    "package_name": "com.DefaultCompany.II_AppLink_Integration",
+    "package_name": "com.dfinity.ii_applink_integration",
     "sha256_cert_fingerprints":
-    ["86:C9:CA:6F:5A:53:7E:75:9C:D7:29:1E:8A:94:90:BE:90:0B:02:12:40:45:19:B6:65:84:3C:02:AB:B5:97:14"]
+    ["A3:E2:36:BC:E9:04:3F:8F:A9:C5:9B:B5:FE:89:95:C8:08:BA:35:2D:07:D8:76:13:65:A9:27:D6:33:6B:44:6E"]
   }
 }]
\ No newline at end of file
diff --git a/native-apps/unity_ii_applink/ii_integration_dapp/src/greet_frontend/src/index.html b/native-apps/unity_ii_applink/ii_integration_dapp/src/greet_frontend/src/index.html
index b2c95ec09..93b7e0415 100644
--- a/native-apps/unity_ii_applink/ii_integration_dapp/src/greet_frontend/src/index.html
+++ b/native-apps/unity_ii_applink/ii_integration_dapp/src/greet_frontend/src/index.html
@@ -21,6 +21,10 @@
         <button id="open">Launch Application by AppLink</button>
       </form>
       <br />
+      <form>
+        <button id="greet">Greet</button>
+      </form>
+      <section id="greeting"></section>
     </main>
   </body>
 </html>
diff --git a/native-apps/unity_ii_applink/ii_integration_dapp/src/greet_frontend/src/index.js b/native-apps/unity_ii_applink/ii_integration_dapp/src/greet_frontend/src/index.js
index 11f07a6c0..c67c32cec 100644
--- a/native-apps/unity_ii_applink/ii_integration_dapp/src/greet_frontend/src/index.js
+++ b/native-apps/unity_ii_applink/ii_integration_dapp/src/greet_frontend/src/index.js
@@ -1,47 +1,30 @@
-import {AuthClient} from "@dfinity/auth-client"
-import {SignIdentity} from "@dfinity/agent";
-import {DelegationIdentity, Ed25519PublicKey } from "@dfinity/identity";
-
-// An incomplete Ed25519KeyIdentity with only the public key provided.
-class IncompleteEd25519KeyIdentity extends SignIdentity {
-    constructor(publicKey) {
-        super();
-        this._publicKey = publicKey;
-    }
-
-    getPublicKey () {
-        return this._publicKey;
-    }
-}
-
-function fromHexString(hexString) {
-    return new Uint8Array((hexString.match(/.{1,2}/g) ?? []).map(byte => parseInt(byte, 16))).buffer;
-}
+import {createActor, greet_backend} from "../../declarations/greet_backend";
+import {AuthClient} from "@dfinity/auth-client";
+import {HttpAgent} from "@dfinity/agent";
+import {DelegationIdentity, Ed25519PublicKey, ECDSAKeyIdentity, DelegationChain} from "@dfinity/identity";
+import {fromHexString} from "@dfinity/identity/lib/cjs/buffer";
 
-let myKeyIdentity;
-let sessionKeyIndex = -1;
+let appPublicKey;
 
 var url = window.location.href;
-sessionKeyIndex = url.indexOf("sessionkey=");
-if (sessionKeyIndex !== -1) {
-    // Parse the public session key and instantiate an IncompleteEd25519KeyIdentity.
-    var sessionkey = url.substring(sessionKeyIndex + "sessionkey=".length);
-
-    var publicKey = Ed25519PublicKey.fromDer(fromHexString(sessionkey));
-    myKeyIdentity = new IncompleteEd25519KeyIdentity(publicKey);
-} else {
-    // TODO: initialize an Ed25519KeyIdentity();
+var publicKeyIndex = url.indexOf("sessionkey=");
+if (publicKeyIndex !== -1) {
+    // Parse the public key.
+    var publicKeyString = url.substring(publicKeyIndex + "sessionkey=".length);
+    appPublicKey = Ed25519PublicKey.fromDer(fromHexString(publicKeyString));
 }
 
-let delegationIdentity;
+let actor = greet_backend;
+let delegationChain;
 
 const loginButton = document.getElementById("login");
 loginButton.onclick = async (e) => {
     e.preventDefault();
 
     // Create an auth client.
+    var middleKeyIdentity = await ECDSAKeyIdentity.generate();
     let authClient = await AuthClient.create({
-        identity: myKeyIdentity,
+        identity: middleKeyIdentity,
     });
 
     // Start the login process and wait for it to finish.
@@ -53,9 +36,24 @@ loginButton.onclick = async (e) => {
     });
 
     // At this point we're authenticated, and we can get the identity from the auth client.
-    const identity = authClient.getIdentity();
-    if (identity instanceof DelegationIdentity) {
-        delegationIdentity = identity;
+    const middleIdentity = authClient.getIdentity();
+
+    // Using the identity obtained from the auth client to create an agent to interact with the IC.
+    const agent = new HttpAgent({identity: middleIdentity});
+    actor = createActor(process.env.GREET_BACKEND_CANISTER_ID, {
+        agent,
+    });
+
+    // Create another delegation with the app public key, then we have two delegations on the chain.
+    if (appPublicKey != null && middleIdentity instanceof DelegationIdentity ) {
+        let middleToApp = await DelegationChain.create(
+            middleKeyIdentity,
+            appPublicKey,
+            new Date(Date.now() + 15 * 60 * 1000),
+            { previous: middleIdentity.getDelegation() },
+        );
+
+        delegationChain = middleToApp;
     }
 
     return false;
@@ -65,19 +63,33 @@ const openButton = document.getElementById("open");
 openButton.onclick = async (e) => {
     e.preventDefault();
 
-    // if (sessionKeyIndex === -1) {
-    //     // TODO: warning for not login from a game.
-    //     return false;
-    // }
+    if (delegationChain == null){
+        console.log("Invalid delegation chain.");
+        return false;
+    }
     
     var url = "https://6x7nu-oaaaa-aaaan-qdaua-cai.icp0.io/authorize?";
-    if (delegationIdentity != null) {
-        var delegationString = JSON.stringify(delegationIdentity.getDelegation().toJSON());
-        console.log(delegationString);
-        url = url + "delegation=" + encodeURIComponent(delegationString);
-    }
+    var delegationString = JSON.stringify(delegationChain.toJSON());    
+    url = url + "delegation=" + encodeURIComponent(delegationString);
+    //console.log(url);
 
     window.open(url, "_self");
 
     return false;
 };
+
+const greetButton = document.getElementById("greet");
+greetButton.onclick = async (e) => {
+    e.preventDefault();
+
+    greetButton.setAttribute("disabled", true);
+
+    // Interact with backend actor, calling the greet method
+    const greeting = await actor.greet();
+
+    greetButton.removeAttribute("disabled");
+
+    document.getElementById("greeting").innerText = greeting;
+
+    return false;
+};
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/BouncyCastle.Cryptography.dll b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/BouncyCastle.Cryptography.dll
new file mode 100644
index 000000000..6ddfa6c5a
Binary files /dev/null and b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/BouncyCastle.Cryptography.dll differ
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Chaos.NaCl.dll.meta b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/BouncyCastle.Cryptography.dll.meta
similarity index 93%
rename from native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Chaos.NaCl.dll.meta
rename to native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/BouncyCastle.Cryptography.dll.meta
index 3a5357487..13f6d5ca5 100644
--- a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Chaos.NaCl.dll.meta
+++ b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/BouncyCastle.Cryptography.dll.meta
@@ -1,5 +1,5 @@
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-guid: f745e12d1a54fa048b17f8a755aee668
+guid: 593489fde6eec1d409339f2068027223
 PluginImporter:
   externalObjects: {}
   serializedVersion: 2
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Chaos.NaCl.dll b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Chaos.NaCl.dll
deleted file mode 100644
index 99a22be95..000000000
Binary files a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Chaos.NaCl.dll and /dev/null differ
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Dahomey.Cbor.dll b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Dahomey.Cbor.dll
deleted file mode 100644
index 0181013b5..000000000
Binary files a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Dahomey.Cbor.dll and /dev/null differ
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.Cryptography.BLS.dll b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.Cryptography.BLS.dll
deleted file mode 100644
index af1d6a3d0..000000000
Binary files a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.Cryptography.BLS.dll and /dev/null differ
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.Cryptography.BLS.dll.meta b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.Cryptography.BLS.dll.meta
deleted file mode 100644
index e1dba25b7..000000000
--- a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.Cryptography.BLS.dll.meta
+++ /dev/null
@@ -1,33 +0,0 @@
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-      settings: {}
-  - first:
-      Editor: Editor
-    second:
-      enabled: 0
-      settings:
-        DefaultValueInitialized: true
-  - first:
-      Windows Store Apps: WindowsStoreApps
-    second:
-      enabled: 0
-      settings:
-        CPU: AnyCPU
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.Agent.dll b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.Agent.dll
index 3a93d8125..9d1a43d52 100644
Binary files a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.Agent.dll and b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.Agent.dll differ
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.BLS.dll b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.BLS.dll
new file mode 100644
index 000000000..b8f114d09
Binary files /dev/null and b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.BLS.dll differ
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Chaos.NaCl.dll.meta b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.BLS.dll.meta
similarity index 93%
rename from native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Chaos.NaCl.dll.meta
rename to native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.BLS.dll.meta
index 3a5357487..c7e3eca2e 100644
--- a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Chaos.NaCl.dll.meta
+++ b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.BLS.dll.meta
@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: f745e12d1a54fa048b17f8a755aee668
+guid: 933c2d47759680543a7661c61b41b2ae
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diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.Candid.dll b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.Candid.dll
index 4f3f4e039..6b7348be6 100644
Binary files a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.Candid.dll and b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/EdjCase.ICP.Candid.dll differ
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/README.md b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/README.md
new file mode 100644
index 000000000..b13d4ca7b
--- /dev/null
+++ b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/README.md
@@ -0,0 +1,6 @@
+# ICP.NET
+
+The libraries in ICP.NET are built from https://github.com/BoomDAO/ICP.NET, with
+
+1. Version `4.0.0`, hashtag `7b51d78b4f4356d767bb86074918a41973c41214`.
+2. `ByteUtil` class is changed from `internal` to `public` in `\ICP.NET\src\Candid\Utilities\ByteUtil.cs` file.
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/README.md.meta b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/README.md.meta
new file mode 100644
index 000000000..b31a6325d
--- /dev/null
+++ b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/README.md.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 4f04216d2bad9a94cb9378defe463e06
+TextScriptImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.Collections.Immutable.dll b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.Collections.Immutable.dll
deleted file mode 100644
index 98774b92a..000000000
Binary files a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.Collections.Immutable.dll and /dev/null differ
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.Collections.Immutable.dll.meta b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.Collections.Immutable.dll.meta
deleted file mode 100644
index 34b4429c9..000000000
--- a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.Collections.Immutable.dll.meta
+++ /dev/null
@@ -1,27 +0,0 @@
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-    second:
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-  userData: 
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diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.Formats.Cbor.dll b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.Formats.Cbor.dll
new file mode 100644
index 000000000..f2e77b766
Binary files /dev/null and b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.Formats.Cbor.dll differ
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.IO.Pipelines.dll.meta b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.Formats.Cbor.dll.meta
similarity index 93%
rename from native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.IO.Pipelines.dll.meta
rename to native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.Formats.Cbor.dll.meta
index bc19e5959..d633142ea 100644
--- a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.IO.Pipelines.dll.meta
+++ b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.Formats.Cbor.dll.meta
@@ -1,5 +1,5 @@
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deleted file mode 100644
index 5a41247f7..000000000
Binary files a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/System.IO.Pipelines.dll and /dev/null differ
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Wasmtime.Dotnet.dll b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Wasmtime.Dotnet.dll
new file mode 100644
index 000000000..b8190e265
Binary files /dev/null and b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Wasmtime.Dotnet.dll differ
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Dahomey.Cbor.dll.meta b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Wasmtime.Dotnet.dll.meta
similarity index 93%
rename from native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Dahomey.Cbor.dll.meta
rename to native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Wasmtime.Dotnet.dll.meta
index 4c337afdf..7d89f570c 100644
--- a/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Dahomey.Cbor.dll.meta
+++ b/native-apps/unity_ii_applink/unity_project/Assets/ICP.NET/Wasmtime.Dotnet.dll.meta
@@ -1,5 +1,5 @@
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   serializedVersion: 2
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/Scenes/SampleScene.unity b/native-apps/unity_ii_applink/unity_project/Assets/Scenes/SampleScene.unity
index 9f68ff852..78d6cfd78 100644
--- a/native-apps/unity_ii_applink/unity_project/Assets/Scenes/SampleScene.unity
+++ b/native-apps/unity_ii_applink/unity_project/Assets/Scenes/SampleScene.unity
@@ -168,6 +168,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 5c68e31d1a87467468d62c1cd739b0a0, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
+  greetFrontend: https://6x7nu-oaaaa-aaaan-qdaua-cai.icp0.io/
   greetBackendCanister: 72rj2-biaaa-aaaan-qdatq-cai
 --- !u!114 &272906662
 MonoBehaviour:
@@ -181,7 +182,6 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 17feafab2ee1b6b4684003f4b0edc397, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  greetFrontend: https://6x7nu-oaaaa-aaaan-qdaua-cai.icp0.io
 --- !u!1 &671559154
 GameObject:
   m_ObjectHideFlags: 0
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/Scripts/DeepLinkPlugin.cs b/native-apps/unity_ii_applink/unity_project/Assets/Scripts/DeepLinkPlugin.cs
index 7e297d3d2..8b5b92cae 100644
--- a/native-apps/unity_ii_applink/unity_project/Assets/Scripts/DeepLinkPlugin.cs
+++ b/native-apps/unity_ii_applink/unity_project/Assets/Scripts/DeepLinkPlugin.cs
@@ -1,7 +1,13 @@
 using UnityEngine;
+using EdjCase.ICP.Agent;
+using EdjCase.ICP.Agent.Identities;
+using EdjCase.ICP.Agent.Models;
+using EdjCase.ICP.Candid.Models;
 using EdjCase.ICP.Candid.Utilities;
 using Newtonsoft.Json;
+using System;
 using System.Web;
+using System.Collections.Generic;
 
 namespace IC.GameKit
 {
@@ -22,7 +28,7 @@ public void Start()
 
         public void OpenBrowser()
         {
-            var target = mTestICPAgent.greetFrontend + "?sessionkey=" + ByteUtil.ToHexString(mTestICPAgent.TestIdentity.PublicKey.Value);
+            var target = mTestICPAgent.greetFrontend + "?sessionkey=" + ByteUtil.ToHexString(mTestICPAgent.TestIdentity.PublicKey.ToDerEncoding());
             Application.OpenURL(target);
         }
 
@@ -40,8 +46,36 @@ public void OnDeepLinkActivated(string url)
             }
 
             var delegationString = HttpUtility.UrlDecode(url.Substring(indexOfDelegation + kDelegationParam.Length));
-            var delegation = JsonConvert.DeserializeObject<DelegationChainModel>(delegationString);
-            mTestICPAgent.Delegation = delegation;
+            mTestICPAgent.DelegationIdentity = ConvertJsonToDelegationIdentity(delegationString);
+        }
+
+        internal DelegationIdentity ConvertJsonToDelegationIdentity(string jsonDelegation)
+        {
+            var delegationChainModel = JsonConvert.DeserializeObject<DelegationChainModel>(jsonDelegation);
+            if (delegationChainModel == null && delegationChainModel.delegations.Length == 0)
+            {
+                Debug.LogError("Invalid delegation chain.");
+                return null;
+            }
+
+            // Initialize DelegationIdentity.
+            var delegations = new List<SignedDelegation>();
+            foreach (var signedDelegationModel in delegationChainModel.delegations)
+            {
+                var pubKey = SubjectPublicKeyInfo.FromDerEncoding(ByteUtil.FromHexString(signedDelegationModel.delegation.pubkey));
+                var expiration = ICTimestamp.FromNanoSeconds(Convert.ToUInt64(signedDelegationModel.delegation.expiration, 16));
+                var delegation = new Delegation(pubKey, expiration);
+
+                var signature = ByteUtil.FromHexString(signedDelegationModel.signature);
+                var signedDelegation = new SignedDelegation(delegation, signature);
+                delegations.Add(signedDelegation);
+            }
+
+            var chainPublicKey = SubjectPublicKeyInfo.FromDerEncoding(ByteUtil.FromHexString(delegationChainModel.publicKey));
+            var delegationChain = new DelegationChain(chainPublicKey, delegations);
+            var delegationIdentity = new DelegationIdentity(mTestICPAgent.TestIdentity, delegationChain);
+
+            return delegationIdentity;
         }
     }
 }
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/Scripts/TestICPAgent.cs b/native-apps/unity_ii_applink/unity_project/Assets/Scripts/TestICPAgent.cs
index 98c60208a..c37baa2d6 100644
--- a/native-apps/unity_ii_applink/unity_project/Assets/Scripts/TestICPAgent.cs
+++ b/native-apps/unity_ii_applink/unity_project/Assets/Scripts/TestICPAgent.cs
@@ -1,13 +1,8 @@
 using UnityEngine;
 using UnityEngine.UI;
-using EdjCase.ICP.Agent;
 using EdjCase.ICP.Agent.Agents;
 using EdjCase.ICP.Agent.Identities;
 using EdjCase.ICP.Candid.Models;
-using EdjCase.ICP.Candid.Utilities;
-using System.Collections.Generic;
-using EdjCase.ICP.Agent.Models;
-using System;
 
 namespace IC.GameKit
 {
@@ -19,17 +14,18 @@ public class TestICPAgent : MonoBehaviour
         Text mMyPrincipalText = null;
         Button mGreetButton = null;
         Ed25519Identity mEd25519Identity = null;
-        DelegationChainModel mDelegation = null;
+        DelegationIdentity mDelegationIdentity = null;
 
         public Ed25519Identity TestIdentity { get { return mEd25519Identity; } }
 
-        internal DelegationChainModel Delegation {
-            get { return mDelegation; } 
-            set 
+        internal DelegationIdentity DelegationIdentity
+        {
+            get { return mDelegationIdentity; }
+            set
             {
-                mDelegation = value;
-                
-                if (mDelegation != null && mGreetButton != null)
+                mDelegationIdentity = value;
+
+                if (mDelegationIdentity != null && mGreetButton != null)
                 {
                     mGreetButton.interactable = true;
                 }
@@ -45,7 +41,7 @@ void Start()
             var buttonGo = GameObject.Find("Button_Greet");
             mGreetButton = buttonGo?.GetComponent<Button>();
 
-            mEd25519Identity = Ed25519Identity.Create();
+            mEd25519Identity = Ed25519Identity.Generate();
         }
 
         // Update is called once per frame
@@ -55,38 +51,20 @@ void Update()
 
         public void Greet()
         {
-            if (mDelegation == null)
-                return;
-
-            CallCanister(mDelegation);
+            CallCanisterGreet();
         }
 
-        private async void CallCanister(DelegationChainModel delegationChainModel)
+        private async void CallCanisterGreet()
         {
-            Debug.Assert(delegationChainModel != null && delegationChainModel.delegations.Length >= 1);
-
-            // Initialize DelegationIdentity.
-            var chainPublicKey = DerEncodedPublicKey.FromDer(ByteUtil.FromHexString(delegationChainModel.publicKey));
-            var delegations = new List<SignedDelegation>();
-            foreach (var signedDelegationModel in delegationChainModel.delegations)
-            {
-                var pubKey = DerEncodedPublicKey.FromDer(ByteUtil.FromHexString(signedDelegationModel.delegation.pubkey));
-                var expiration = ICTimestamp.FromNanoSeconds(Convert.ToUInt64(signedDelegationModel.delegation.expiration, 16));
-                var delegation = new Delegation(pubKey.Value, expiration);
-
-                var signature = ByteUtil.FromHexString(signedDelegationModel.signature);
-                var signedDelegation = new SignedDelegation(delegation, signature);
-                delegations.Add(signedDelegation);
-            }
-            var delegationChain = new DelegationChain(chainPublicKey, delegations);
-            var delegationIdentity = new DelegationIdentity(TestIdentity, delegationChain);
+            if (DelegationIdentity == null)
+                return;
 
             // Initialize HttpAgent.
-            var agent = new HttpAgent(delegationIdentity);
+            var agent = new HttpAgent(DelegationIdentity);
 
             var canisterId = Principal.FromText(greetBackendCanister);
 
-            // Intialize the client and make the call.
+            // Initialize the client and make the call.
             var client = new GreetingClient.GreetingClient(agent, canisterId);
             var content = await client.Greet();
 
diff --git a/native-apps/unity_ii_applink/unity_project/Assets/test.keystore b/native-apps/unity_ii_applink/unity_project/Assets/test.keystore
index 56b8044db..d89fa8e23 100644
Binary files a/native-apps/unity_ii_applink/unity_project/Assets/test.keystore and b/native-apps/unity_ii_applink/unity_project/Assets/test.keystore differ
diff --git a/native-apps/unity_ii_applink/unity_project/README.md b/native-apps/unity_ii_applink/unity_project/README.md
index fbdc33bdd..2bec598d3 100644
--- a/native-apps/unity_ii_applink/unity_project/README.md
+++ b/native-apps/unity_ii_applink/unity_project/README.md
@@ -8,7 +8,7 @@ In this example, you can learn how to communicate with the IC from C#. As we des
 1. Provide a plugin to handle the communication between C# and the browser.
 2. Register the App Links in the Android manifest file.
 3. Generate the `Ed25519KeyIdentity` in C# and pass the public key to the Web Brower.
-4. Receive the `DelegationIdentity` from the Web Brower and pass it from Java to C#.
+4. Receive the `DelegationChain` from the Web Brower and composite the `DelegationIdentity` from it.
 5. Use the `DelegationIdentity` to communicate with the backend canister.
 
 ## Key Files
@@ -19,24 +19,24 @@ There're several important files in this example.
   This is a Unity post-build processor for Android platform, which inserts the App Links URL scheme into the AndroidManifest.xml.
 
 - [DeepLinkPlugin.cs](./Assets/Scripts/DeepLinkPlugin.cs)  
-  It's a plugin which provides functions to open the web browser, handle the DeepLink activation, and parse the delegation from Json string.
+  It's a plugin which provides functions to open the web browser, handle the App Link activation, and composite the `DelegationIdentity` from Json string.
 
 - [GreetingClient.cs](./Assets/Scripts/GreetingClient.cs)  
-  This provides the C# APIs for calling the Greeting backend canister in [ii_integration_page](../ii_integration_page/README.md). It can be generated by running the `ClientGenerator` provided by [ICP.NET](https://github.com/BoomDAO/ICP.NET).
+  This provides the C# APIs for calling the Greeting backend canister in [ii_integration_dapp](../ii_integration_dapp/README.md). It can be generated by running the `ClientGenerator` provided by [ICP.NET](https://github.com/BoomDAO/ICP.NET).
 
 - [TestICPAgent.cs](./Assets/Scripts/TestICPAgent.cs)  
   This is a testing script which can parse the delegation identity and call the APIs provided by [GreetingClient.cs](./Assets/Scripts/GreetingClient.cs) to communicate with the greeting backend canister.
 
 ## Deployment
 
-The current Unity project is configured to use the [deployed dapp](https://6x7nu-oaaaa-aaaan-qdaua-cai.icp0.io), its [assetlinks.json file] contains the `SHA256` value from the [test.keystore file](./Assets/test.keystore) (the passwords for the keystore and `ii-test` key are both `unity123456`). If you deploy your own dapp by following [ii_integration_page](../ii_integration_page/README.md), you need to make some modifications before you start to build this project to Android platform in Unity.
+The current Unity project is configured to use the [deployed dapp](https://6x7nu-oaaaa-aaaan-qdaua-cai.icp0.io), its `assetlinks.json` file contains the `SHA256` value from the [test.keystore file](./Assets/test.keystore) (the passwords for the keystore and `ii-test` key are both `unity123456`). If you deploy your own dapp by following [ii_integration_dapp](../ii_integration_dapp/README.md), you need to make some modifications before you start to build this project to Android platform in Unity.
 
 1. In Unity, open the `Assets\Scenes\SampleScene.unity`.
 2. Navigate to the `AgentAndPlugin` in the scene hierarchy.
 3. Update the `Greet Backend Canister` with your own greeting backend canister id.
 4. Update the `Greet Frontend` with your own greeting frontend.
-5. If you use a different URL scheme to launch your Unity project in [ii_integration_page](../ii_integration_page/README.md), please update the `kAndroidScheme`, `kAndroidHost` and `kURLPath` in [AndroidPostBuildProcessor.cs](./Assets/Editor/AndroidPostBuildProcessor.cs) accordingly.
-6. Naviagte to `Editor -> Project Settings -> Android -> Publishing Settings`, choose the keystore file which contains the same `SHA256` value that you use to in your [assetlinks.json file](../ii_integration_page//src/greet_frontend/assets/.well-known/assetlinks.json).
+5. If you use a different URL scheme to launch your Unity project in [ii_integration_dapp](../ii_integration_dapp/README.md), please update the `kAndroidScheme`, `kAndroidHost` and `kURLPath` in [AndroidPostBuildProcessor.cs](./Assets/Editor/AndroidPostBuildProcessor.cs) accordingly.
+6. Naviagte to `Editor -> Project Settings -> Android -> Publishing Settings`, choose the keystore file which contains the same `SHA256` value that you use to in your [assetlinks.json file](../ii_integration_dapp/src/greet_frontend/assets/.well-known/assetlinks.json).
 
 After updating your Unity project correctly, please build to Android platform in Unity, just 
 1. Go to `File -> Build Settings` window.
@@ -45,7 +45,7 @@ After updating your Unity project correctly, please build to Android platform in
 
 ## Verification
 
-While installing your app on your Android devices, the Android installer will fetch the [assetlinks.json file](../ii_integration_page//src/greet_frontend/assets/.well-known/assetlinks.json) from the website and verify the `SHA256` value. But sometimes the verification might fail due to reasons like an unstable network. Once you find the Android App Links doesn't work as you expected, you can run the below [adb command](https://developer.android.com/tools/adb) to retrieve the domain verification status of your apps.
+While installing your app on your Android devices, the Android installer will fetch the [assetlinks.json file](../ii_integration_dapp/src/greet_frontend/assets/.well-known/assetlinks.json) from the website and verify the `SHA256` value. But sometimes the verification might fail due to reasons like an unstable network. Once you find the Android App Links doesn't work as you expected, you can run the below [adb command](https://developer.android.com/tools/adb) to retrieve the domain verification status of your apps.
 
 ```
 adb shell pm get-app-links <your-package-name>
@@ -57,7 +57,7 @@ The below is the result of running this command against this sample Unity projec
 PS ..> adb shell pm get-app-links com.dfinity.ii_applink_integration
   com.dfinity.ii_applink_integration:
     ID: 9be82cc2-52ba-4e91-a152-5ba976d6176a
-    Signatures: [1A:EB:B6:B9:53:B7:E6:78:EB:C2:AD:24:C8:7F:6A:22:3F:F6:14:7C:1D:D3:2C:AB:55:D6:79:2F:3E:0A:C3:B8]
+    Signatures: [A3:E2:36:BC:E9:04:3F:8F:A9:C5:9B:B5:FE:89:95:C8:08:BA:35:2D:07:D8:76:13:65:A9:27:D6:33:6B:44:6E]
     Domain verification state:
       6x7nu-oaaaa-aaaan-qdaua-cai.icp0.io: verified
 ```
diff --git a/native-apps/unity_ii_deeplink/README.md b/native-apps/unity_ii_deeplink/README.md
index 0d24a9b80..aea5880c6 100644
--- a/native-apps/unity_ii_deeplink/README.md
+++ b/native-apps/unity_ii_deeplink/README.md
@@ -9,7 +9,7 @@ Please refer to [README](./ii_integration_dapp/README.md) for details.
 This is a Unity project with [ICP.NET](https://github.com/BoomDAO/ICP.NET) embedded, which is a C# agent that is able to communicate with the IC from C#. Please refer to [README](./unity_project/README.md) for details. 
 
 ## Workflow
-Here is the basic workflow that how to integrate with Internet Identity from a Unity mobile game. The basic idea is to open the Web Browser from the game, login in with II in the browser, and pass the DelegationIdentity back to the game.
+Here is the basic workflow that how to integrate with Internet Identity from a Unity mobile game. The basic idea is to open the Web Browser from the game, login in with II in the browser, and pass the `DelegationChain` back to the game.
 
 The steps in detail are described below:
 
@@ -23,6 +23,12 @@ The steps in detail are described below:
 
 4. Login with your Internet Identity in the Web Browser.
 
-5. Launch the application via DeepLink, and pass the `DelegationIdentity` back to the game as the URL parameter.
+5. Launch the application via DeepLink, and pass the `DelegationChain` back to the game as the URL parameter.
 
-6. Call the backend canister with the `DelegationIdentity` to greet.
+6. Composite the `DelegationIdentity` with `DelegationChain` and the `Ed25519Identity`.
+
+7. Call the backend canister with the `DelegationIdentity` to greet.
+
+## Attention
+
+Please keep in mind that DeepLink is not safe as AppLinks on Android, please read [this document](https://developer.android.com/training/app-links#understand-different-types-links) for details. Overall, Android App Links offer better user experience, along with better security. Please refer to the [unity_ii_applink](../unity_ii_applink) sample for more information.
\ No newline at end of file
diff --git a/native-apps/unity_ii_deeplink/ii_integration_dapp/README.md b/native-apps/unity_ii_deeplink/ii_integration_dapp/README.md
index 99b959fac..b3e28298c 100644
--- a/native-apps/unity_ii_deeplink/ii_integration_dapp/README.md
+++ b/native-apps/unity_ii_deeplink/ii_integration_dapp/README.md
@@ -4,13 +4,15 @@ This example derives from the [internet_identity_integration](https://github.com
 
 ## Overview
 
-This example shows a special case to support login with the `IncompleteEd25519KeyIdentity` which only contains the public key. The reason why we support this is all for security. 
+This example shows a use case to support login with the two delegations on the `DelegationChain`.
 
 As we described in [Internet Identity Integration](../README.md#workflow), users can log in with II from the game. Usually what they do is
 
 1. Generate the `Ed25519KeyIdentity` supported by [ICP.NET](https://github.com/BoomDAO/ICP.NET) in the Unity game.
-2. For security purposes, only pass the public key of the `Ed25519KeyIdentity` to the Web browser for login, this is where `IncompleteEd25519KeyIdentity` can be used for.
-3. In [index.js](./src/greet_frontend/src/index.js), we describe how to retrieve the public key of the `Ed25519Identity` from the URL parameter, use it to instantiate an `IncompleteEd25519KeyIdentity`, and log in with Internet Identity. 
+2. For security purposes, only pass the public key of the `Ed25519KeyIdentity` to the Web browser for login. And only the public key is necessary when creating a `DelegationChain`.
+3. In [index.js](./src/greet_frontend/src/index.js), we describe how to 
+    - log in with Internet Identity with the frontend generated session key
+    - retrieve the public key of the `Ed25519Identity` from the URL parameter and create another delegation with it. 
 
 With this, users don't need to pass the private key around, also they don't need to store the private key outside of the game as they can regenerate the key pairs for every session.
 
@@ -26,4 +28,4 @@ Once you set up the IC development environment locally and update the example as
 2. Run `npm install` to install the npm packages
 3. Run `dfx start --background`
 4. Run `dfx deploy --network=ic --with-cycles=1000000000000`  
-   Here we recommend deploying the dapp to the IC mainnet as it's easier to access it from your mobile devices. Or you can use the [deployed dapp](https://6x7nu-oaaaa-aaaan-qdaua-cai.icp0.io) instead.
+   Here we recommend deploying the dapp to the IC mainnet as it's easier to access it from your mobile devices. Or you can use the [deployed dapp](https://qsgof-4qaaa-aaaan-qekqq-cai.icp0.io) instead.
diff --git a/native-apps/unity_ii_deeplink/ii_integration_dapp/canister_ids.json b/native-apps/unity_ii_deeplink/ii_integration_dapp/canister_ids.json
new file mode 100644
index 000000000..eab091fde
--- /dev/null
+++ b/native-apps/unity_ii_deeplink/ii_integration_dapp/canister_ids.json
@@ -0,0 +1,8 @@
+{
+  "greet_backend": {
+    "ic": "qvhir-riaaa-aaaan-qekqa-cai"
+  },
+  "greet_frontend": {
+    "ic": "qsgof-4qaaa-aaaan-qekqq-cai"
+  }
+}
\ No newline at end of file
diff --git a/native-apps/unity_ii_deeplink/ii_integration_dapp/src/greet_frontend/src/index.html b/native-apps/unity_ii_deeplink/ii_integration_dapp/src/greet_frontend/src/index.html
index 8f39e1205..3360f8d10 100644
--- a/native-apps/unity_ii_deeplink/ii_integration_dapp/src/greet_frontend/src/index.html
+++ b/native-apps/unity_ii_deeplink/ii_integration_dapp/src/greet_frontend/src/index.html
@@ -21,6 +21,10 @@
         <button id="open">Launch Application by DeepLink</button>
       </form>
       <br />
+      <form>
+        <button id="greet">Greet</button>
+      </form>
+      <section id="greeting"></section>
     </main>
   </body>
 </html>
diff --git a/native-apps/unity_ii_deeplink/ii_integration_dapp/src/greet_frontend/src/index.js b/native-apps/unity_ii_deeplink/ii_integration_dapp/src/greet_frontend/src/index.js
index 48c5c211e..ea63a5a7e 100644
--- a/native-apps/unity_ii_deeplink/ii_integration_dapp/src/greet_frontend/src/index.js
+++ b/native-apps/unity_ii_deeplink/ii_integration_dapp/src/greet_frontend/src/index.js
@@ -1,47 +1,30 @@
-import {AuthClient} from "@dfinity/auth-client"
-import {SignIdentity} from "@dfinity/agent";
-import {DelegationIdentity, Ed25519PublicKey } from "@dfinity/identity";
-
-// An incomplete Ed25519KeyIdentity with only the public key provided.
-class IncompleteEd25519KeyIdentity extends SignIdentity {
-    constructor(publicKey) {
-        super();
-        this._publicKey = publicKey;
-    }
-
-    getPublicKey () {
-        return this._publicKey;
-    }
-}
-
-function fromHexString(hexString) {
-    return new Uint8Array((hexString.match(/.{1,2}/g) ?? []).map(byte => parseInt(byte, 16))).buffer;
-}
+import {createActor, greet_backend} from "../../declarations/greet_backend";
+import {AuthClient} from "@dfinity/auth-client";
+import {HttpAgent} from "@dfinity/agent";
+import {DelegationIdentity, Ed25519PublicKey, ECDSAKeyIdentity, DelegationChain} from "@dfinity/identity";
+import {fromHexString} from "@dfinity/identity/lib/cjs/buffer";
 
-let myKeyIdentity;
-let sessionKeyIndex = -1;
+let appPublicKey;
 
 var url = window.location.href;
-sessionKeyIndex = url.indexOf("sessionkey=");
-if (sessionKeyIndex !== -1) {
-    // Parse the public session key and instantiate an IncompleteEd25519KeyIdentity.
-    var sessionkey = url.substring(sessionKeyIndex + "sessionkey=".length);
-
-    var publicKey = Ed25519PublicKey.fromDer(fromHexString(sessionkey));
-    myKeyIdentity = new IncompleteEd25519KeyIdentity(publicKey);
-} else {
-    // TODO: initialize an Ed25519KeyIdentity();
+var publicKeyIndex = url.indexOf("sessionkey=");
+if (publicKeyIndex !== -1) {
+    // Parse the public key.
+    var publicKeyString = url.substring(publicKeyIndex + "sessionkey=".length);
+    appPublicKey = Ed25519PublicKey.fromDer(fromHexString(publicKeyString));
 }
 
-let delegationIdentity;
+let actor = greet_backend;
+let delegationChain;
 
 const loginButton = document.getElementById("login");
 loginButton.onclick = async (e) => {
     e.preventDefault();
 
     // Create an auth client.
+    var middleKeyIdentity = await ECDSAKeyIdentity.generate();
     let authClient = await AuthClient.create({
-        identity: myKeyIdentity,
+        identity: middleKeyIdentity,
     });
 
     // Start the login process and wait for it to finish.
@@ -53,9 +36,24 @@ loginButton.onclick = async (e) => {
     });
 
     // At this point we're authenticated, and we can get the identity from the auth client.
-    const identity = authClient.getIdentity();
-    if (identity instanceof DelegationIdentity) {
-        delegationIdentity = identity;
+    const middleIdentity = authClient.getIdentity();
+
+    // Using the identity obtained from the auth client to create an agent to interact with the IC.
+    const agent = new HttpAgent({identity: middleIdentity});
+    actor = createActor(process.env.GREET_BACKEND_CANISTER_ID, {
+        agent,
+    });
+
+    // Create another delegation with the app public key, then we have two delegations on the chain.
+    if (appPublicKey != null && middleIdentity instanceof DelegationIdentity ) {
+        let middleToApp = await DelegationChain.create(
+            middleKeyIdentity,
+            appPublicKey,
+            new Date(Date.now() + 15 * 60 * 1000),
+            { previous: middleIdentity.getDelegation() },
+        );
+
+        delegationChain = middleToApp;
     }
 
     return false;
@@ -65,19 +63,33 @@ const openButton = document.getElementById("open");
 openButton.onclick = async (e) => {
     e.preventDefault();
 
-    if (sessionKeyIndex === -1) {
-        // TODO: warning for not login from a game.
+    if (delegationChain == null){
+        console.log("Invalid delegation chain.");
         return false;
     }
-    
+
     var url = "internetidentity://authorize?";
-    if (delegationIdentity != null) {
-        var delegationString = JSON.stringify(delegationIdentity.getDelegation().toJSON());
-        console.log(delegationString);
-        url = url + "delegation=" + encodeURIComponent(delegationString);
-    }
+    var delegationString = JSON.stringify(delegationChain.toJSON());
+    url = url + "delegation=" + encodeURIComponent(delegationString);
+    //console.log(url);
 
     window.open(url, "_self");
 
     return false;
 };
+
+const greetButton = document.getElementById("greet");
+greetButton.onclick = async (e) => {
+    e.preventDefault();
+
+    greetButton.setAttribute("disabled", true);
+
+    // Interact with backend actor, calling the greet method
+    const greeting = await actor.greet();
+
+    greetButton.removeAttribute("disabled");
+
+    document.getElementById("greeting").innerText = greeting;
+
+    return false;
+};
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/BouncyCastle.Cryptography.dll b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/BouncyCastle.Cryptography.dll
new file mode 100644
index 000000000..6ddfa6c5a
Binary files /dev/null and b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/BouncyCastle.Cryptography.dll differ
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/BouncyCastle.Cryptography.dll.meta b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/BouncyCastle.Cryptography.dll.meta
new file mode 100644
index 000000000..13f6d5ca5
--- /dev/null
+++ b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/BouncyCastle.Cryptography.dll.meta
@@ -0,0 +1,33 @@
+fileFormatVersion: 2
+guid: 593489fde6eec1d409339f2068027223
+PluginImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  iconMap: {}
+  executionOrder: {}
+  defineConstraints: []
+  isPreloaded: 0
+  isOverridable: 0
+  isExplicitlyReferenced: 0
+  validateReferences: 1
+  platformData:
+  - first:
+      Any: 
+    second:
+      enabled: 1
+      settings: {}
+  - first:
+      Editor: Editor
+    second:
+      enabled: 0
+      settings:
+        DefaultValueInitialized: true
+  - first:
+      Windows Store Apps: WindowsStoreApps
+    second:
+      enabled: 0
+      settings:
+        CPU: AnyCPU
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Chaos.NaCl.dll b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Chaos.NaCl.dll
deleted file mode 100644
index 99a22be95..000000000
Binary files a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Chaos.NaCl.dll and /dev/null differ
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Dahomey.Cbor.dll b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Dahomey.Cbor.dll
deleted file mode 100644
index 0181013b5..000000000
Binary files a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Dahomey.Cbor.dll and /dev/null differ
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Dahomey.Cbor.dll.meta b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Dahomey.Cbor.dll.meta
deleted file mode 100644
index 4c337afdf..000000000
--- a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Dahomey.Cbor.dll.meta
+++ /dev/null
@@ -1,33 +0,0 @@
-fileFormatVersion: 2
-guid: 2762ae604c55d504b973b2b9a472f2a4
-PluginImporter:
-  externalObjects: {}
-  serializedVersion: 2
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-  defineConstraints: []
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-      settings: {}
-  - first:
-      Editor: Editor
-    second:
-      enabled: 0
-      settings:
-        DefaultValueInitialized: true
-  - first:
-      Windows Store Apps: WindowsStoreApps
-    second:
-      enabled: 0
-      settings:
-        CPU: AnyCPU
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.Cryptography.BLS.dll b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.Cryptography.BLS.dll
deleted file mode 100644
index af1d6a3d0..000000000
Binary files a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.Cryptography.BLS.dll and /dev/null differ
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.Cryptography.BLS.dll.meta b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.Cryptography.BLS.dll.meta
deleted file mode 100644
index e1dba25b7..000000000
--- a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.Cryptography.BLS.dll.meta
+++ /dev/null
@@ -1,33 +0,0 @@
-fileFormatVersion: 2
-guid: 5ee3fda08d13e3d498234a64d78a5fb4
-PluginImporter:
-  externalObjects: {}
-  serializedVersion: 2
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-  validateReferences: 1
-  platformData:
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-      Any: 
-    second:
-      enabled: 1
-      settings: {}
-  - first:
-      Editor: Editor
-    second:
-      enabled: 0
-      settings:
-        DefaultValueInitialized: true
-  - first:
-      Windows Store Apps: WindowsStoreApps
-    second:
-      enabled: 0
-      settings:
-        CPU: AnyCPU
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.Agent.dll b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.Agent.dll
index 3a93d8125..9d1a43d52 100644
Binary files a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.Agent.dll and b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.Agent.dll differ
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.BLS.dll b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.BLS.dll
new file mode 100644
index 000000000..b8f114d09
Binary files /dev/null and b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.BLS.dll differ
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.BLS.dll.meta b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.BLS.dll.meta
new file mode 100644
index 000000000..c7e3eca2e
--- /dev/null
+++ b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.BLS.dll.meta
@@ -0,0 +1,33 @@
+fileFormatVersion: 2
+guid: 933c2d47759680543a7661c61b41b2ae
+PluginImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  iconMap: {}
+  executionOrder: {}
+  defineConstraints: []
+  isPreloaded: 0
+  isOverridable: 0
+  isExplicitlyReferenced: 0
+  validateReferences: 1
+  platformData:
+  - first:
+      Any: 
+    second:
+      enabled: 1
+      settings: {}
+  - first:
+      Editor: Editor
+    second:
+      enabled: 0
+      settings:
+        DefaultValueInitialized: true
+  - first:
+      Windows Store Apps: WindowsStoreApps
+    second:
+      enabled: 0
+      settings:
+        CPU: AnyCPU
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.Candid.dll b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.Candid.dll
index 4f3f4e039..6b7348be6 100644
Binary files a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.Candid.dll and b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/EdjCase.ICP.Candid.dll differ
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/README.md b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/README.md
new file mode 100644
index 000000000..b13d4ca7b
--- /dev/null
+++ b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/README.md
@@ -0,0 +1,6 @@
+# ICP.NET
+
+The libraries in ICP.NET are built from https://github.com/BoomDAO/ICP.NET, with
+
+1. Version `4.0.0`, hashtag `7b51d78b4f4356d767bb86074918a41973c41214`.
+2. `ByteUtil` class is changed from `internal` to `public` in `\ICP.NET\src\Candid\Utilities\ByteUtil.cs` file.
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/README.md.meta b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/README.md.meta
new file mode 100644
index 000000000..b31a6325d
--- /dev/null
+++ b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/README.md.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 4f04216d2bad9a94cb9378defe463e06
+TextScriptImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.Collections.Immutable.dll b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.Collections.Immutable.dll
deleted file mode 100644
index 98774b92a..000000000
Binary files a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.Collections.Immutable.dll and /dev/null differ
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.Collections.Immutable.dll.meta b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.Collections.Immutable.dll.meta
deleted file mode 100644
index 34b4429c9..000000000
--- a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.Collections.Immutable.dll.meta
+++ /dev/null
@@ -1,27 +0,0 @@
-fileFormatVersion: 2
-guid: 07c068288c2d9674baf2713ade0ce777
-PluginImporter:
-  externalObjects: {}
-  serializedVersion: 2
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-  executionOrder: {}
-  defineConstraints: []
-  isPreloaded: 0
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-  isExplicitlyReferenced: 0
-  validateReferences: 1
-  platformData:
-  - first:
-      Any: 
-    second:
-      enabled: 1
-      settings: {}
-  - first:
-      Editor: Editor
-    second:
-      enabled: 0
-      settings:
-        DefaultValueInitialized: true
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.Formats.Cbor.dll b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.Formats.Cbor.dll
new file mode 100644
index 000000000..f2e77b766
Binary files /dev/null and b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.Formats.Cbor.dll differ
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.Formats.Cbor.dll.meta b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.Formats.Cbor.dll.meta
new file mode 100644
index 000000000..d633142ea
--- /dev/null
+++ b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.Formats.Cbor.dll.meta
@@ -0,0 +1,33 @@
+fileFormatVersion: 2
+guid: b7149630e9d423f43bbeaf40e8c86807
+PluginImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  iconMap: {}
+  executionOrder: {}
+  defineConstraints: []
+  isPreloaded: 0
+  isOverridable: 0
+  isExplicitlyReferenced: 0
+  validateReferences: 1
+  platformData:
+  - first:
+      Any: 
+    second:
+      enabled: 1
+      settings: {}
+  - first:
+      Editor: Editor
+    second:
+      enabled: 0
+      settings:
+        DefaultValueInitialized: true
+  - first:
+      Windows Store Apps: WindowsStoreApps
+    second:
+      enabled: 0
+      settings:
+        CPU: AnyCPU
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.IO.Pipelines.dll b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.IO.Pipelines.dll
deleted file mode 100644
index 5a41247f7..000000000
Binary files a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.IO.Pipelines.dll and /dev/null differ
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.IO.Pipelines.dll.meta b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.IO.Pipelines.dll.meta
deleted file mode 100644
index bc19e5959..000000000
--- a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/System.IO.Pipelines.dll.meta
+++ /dev/null
@@ -1,33 +0,0 @@
-fileFormatVersion: 2
-guid: ce5b0ae0fccda8548aaf3ae7c72c5758
-PluginImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  iconMap: {}
-  executionOrder: {}
-  defineConstraints: []
-  isPreloaded: 0
-  isOverridable: 0
-  isExplicitlyReferenced: 0
-  validateReferences: 1
-  platformData:
-  - first:
-      Any: 
-    second:
-      enabled: 1
-      settings: {}
-  - first:
-      Editor: Editor
-    second:
-      enabled: 0
-      settings:
-        DefaultValueInitialized: true
-  - first:
-      Windows Store Apps: WindowsStoreApps
-    second:
-      enabled: 0
-      settings:
-        CPU: AnyCPU
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Wasmtime.Dotnet.dll b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Wasmtime.Dotnet.dll
new file mode 100644
index 000000000..b8190e265
Binary files /dev/null and b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Wasmtime.Dotnet.dll differ
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Wasmtime.Dotnet.dll.meta b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Wasmtime.Dotnet.dll.meta
new file mode 100644
index 000000000..7d89f570c
--- /dev/null
+++ b/native-apps/unity_ii_deeplink/unity_project/Assets/ICP.NET/Wasmtime.Dotnet.dll.meta
@@ -0,0 +1,33 @@
+fileFormatVersion: 2
+guid: 471526ac3bbfe74498c79e74a8c37986
+PluginImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  iconMap: {}
+  executionOrder: {}
+  defineConstraints: []
+  isPreloaded: 0
+  isOverridable: 0
+  isExplicitlyReferenced: 0
+  validateReferences: 1
+  platformData:
+  - first:
+      Any: 
+    second:
+      enabled: 1
+      settings: {}
+  - first:
+      Editor: Editor
+    second:
+      enabled: 0
+      settings:
+        DefaultValueInitialized: true
+  - first:
+      Windows Store Apps: WindowsStoreApps
+    second:
+      enabled: 0
+      settings:
+        CPU: AnyCPU
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/Scenes/SampleScene.unity b/native-apps/unity_ii_deeplink/unity_project/Assets/Scenes/SampleScene.unity
index 62a199e0d..458eb4428 100644
--- a/native-apps/unity_ii_deeplink/unity_project/Assets/Scenes/SampleScene.unity
+++ b/native-apps/unity_ii_deeplink/unity_project/Assets/Scenes/SampleScene.unity
@@ -168,7 +168,8 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 5c68e31d1a87467468d62c1cd739b0a0, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  greetBackendCanister: 72rj2-biaaa-aaaan-qdatq-cai
+  greetFrontend: https://qsgof-4qaaa-aaaan-qekqq-cai.icp0.io/
+  greetBackendCanister: qvhir-riaaa-aaaan-qekqa-cai
 --- !u!114 &272906662
 MonoBehaviour:
   m_ObjectHideFlags: 0
@@ -181,7 +182,6 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 17feafab2ee1b6b4684003f4b0edc397, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  greetFrontend: https://6x7nu-oaaaa-aaaan-qdaua-cai.icp0.io/
 --- !u!1 &671559154
 GameObject:
   m_ObjectHideFlags: 0
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/Scripts/DeepLinkPlugin.cs b/native-apps/unity_ii_deeplink/unity_project/Assets/Scripts/DeepLinkPlugin.cs
index 7e297d3d2..8b5b92cae 100644
--- a/native-apps/unity_ii_deeplink/unity_project/Assets/Scripts/DeepLinkPlugin.cs
+++ b/native-apps/unity_ii_deeplink/unity_project/Assets/Scripts/DeepLinkPlugin.cs
@@ -1,7 +1,13 @@
 using UnityEngine;
+using EdjCase.ICP.Agent;
+using EdjCase.ICP.Agent.Identities;
+using EdjCase.ICP.Agent.Models;
+using EdjCase.ICP.Candid.Models;
 using EdjCase.ICP.Candid.Utilities;
 using Newtonsoft.Json;
+using System;
 using System.Web;
+using System.Collections.Generic;
 
 namespace IC.GameKit
 {
@@ -22,7 +28,7 @@ public void Start()
 
         public void OpenBrowser()
         {
-            var target = mTestICPAgent.greetFrontend + "?sessionkey=" + ByteUtil.ToHexString(mTestICPAgent.TestIdentity.PublicKey.Value);
+            var target = mTestICPAgent.greetFrontend + "?sessionkey=" + ByteUtil.ToHexString(mTestICPAgent.TestIdentity.PublicKey.ToDerEncoding());
             Application.OpenURL(target);
         }
 
@@ -40,8 +46,36 @@ public void OnDeepLinkActivated(string url)
             }
 
             var delegationString = HttpUtility.UrlDecode(url.Substring(indexOfDelegation + kDelegationParam.Length));
-            var delegation = JsonConvert.DeserializeObject<DelegationChainModel>(delegationString);
-            mTestICPAgent.Delegation = delegation;
+            mTestICPAgent.DelegationIdentity = ConvertJsonToDelegationIdentity(delegationString);
+        }
+
+        internal DelegationIdentity ConvertJsonToDelegationIdentity(string jsonDelegation)
+        {
+            var delegationChainModel = JsonConvert.DeserializeObject<DelegationChainModel>(jsonDelegation);
+            if (delegationChainModel == null && delegationChainModel.delegations.Length == 0)
+            {
+                Debug.LogError("Invalid delegation chain.");
+                return null;
+            }
+
+            // Initialize DelegationIdentity.
+            var delegations = new List<SignedDelegation>();
+            foreach (var signedDelegationModel in delegationChainModel.delegations)
+            {
+                var pubKey = SubjectPublicKeyInfo.FromDerEncoding(ByteUtil.FromHexString(signedDelegationModel.delegation.pubkey));
+                var expiration = ICTimestamp.FromNanoSeconds(Convert.ToUInt64(signedDelegationModel.delegation.expiration, 16));
+                var delegation = new Delegation(pubKey, expiration);
+
+                var signature = ByteUtil.FromHexString(signedDelegationModel.signature);
+                var signedDelegation = new SignedDelegation(delegation, signature);
+                delegations.Add(signedDelegation);
+            }
+
+            var chainPublicKey = SubjectPublicKeyInfo.FromDerEncoding(ByteUtil.FromHexString(delegationChainModel.publicKey));
+            var delegationChain = new DelegationChain(chainPublicKey, delegations);
+            var delegationIdentity = new DelegationIdentity(mTestICPAgent.TestIdentity, delegationChain);
+
+            return delegationIdentity;
         }
     }
 }
diff --git a/native-apps/unity_ii_deeplink/unity_project/Assets/Scripts/TestICPAgent.cs b/native-apps/unity_ii_deeplink/unity_project/Assets/Scripts/TestICPAgent.cs
index 98c60208a..dfe51e0ad 100644
--- a/native-apps/unity_ii_deeplink/unity_project/Assets/Scripts/TestICPAgent.cs
+++ b/native-apps/unity_ii_deeplink/unity_project/Assets/Scripts/TestICPAgent.cs
@@ -1,35 +1,31 @@
 using UnityEngine;
 using UnityEngine.UI;
-using EdjCase.ICP.Agent;
 using EdjCase.ICP.Agent.Agents;
 using EdjCase.ICP.Agent.Identities;
 using EdjCase.ICP.Candid.Models;
-using EdjCase.ICP.Candid.Utilities;
-using System.Collections.Generic;
-using EdjCase.ICP.Agent.Models;
-using System;
 
 namespace IC.GameKit
 {
     public class TestICPAgent : MonoBehaviour
     {
-        public string greetFrontend = "https://6x7nu-oaaaa-aaaan-qdaua-cai.icp0.io/";
-        public string greetBackendCanister = "72rj2-biaaa-aaaan-qdatq-cai";
+        public string greetFrontend = "https://qsgof-4qaaa-aaaan-qekqq-cai.icp0.io/";
+        public string greetBackendCanister = "qvhir-riaaa-aaaan-qekqa-cai";
 
         Text mMyPrincipalText = null;
         Button mGreetButton = null;
         Ed25519Identity mEd25519Identity = null;
-        DelegationChainModel mDelegation = null;
+        DelegationIdentity mDelegationIdentity = null;
 
         public Ed25519Identity TestIdentity { get { return mEd25519Identity; } }
 
-        internal DelegationChainModel Delegation {
-            get { return mDelegation; } 
+        internal DelegationIdentity DelegationIdentity
+        {
+            get { return mDelegationIdentity; } 
             set 
             {
-                mDelegation = value;
+                mDelegationIdentity = value;
                 
-                if (mDelegation != null && mGreetButton != null)
+                if (mDelegationIdentity != null && mGreetButton != null)
                 {
                     mGreetButton.interactable = true;
                 }
@@ -45,7 +41,7 @@ void Start()
             var buttonGo = GameObject.Find("Button_Greet");
             mGreetButton = buttonGo?.GetComponent<Button>();
 
-            mEd25519Identity = Ed25519Identity.Create();
+            mEd25519Identity = Ed25519Identity.Generate();
         }
 
         // Update is called once per frame
@@ -55,38 +51,20 @@ void Update()
 
         public void Greet()
         {
-            if (mDelegation == null)
-                return;
-
-            CallCanister(mDelegation);
+            CallCanisterGreet();
         }
 
-        private async void CallCanister(DelegationChainModel delegationChainModel)
+        private async void CallCanisterGreet()
         {
-            Debug.Assert(delegationChainModel != null && delegationChainModel.delegations.Length >= 1);
-
-            // Initialize DelegationIdentity.
-            var chainPublicKey = DerEncodedPublicKey.FromDer(ByteUtil.FromHexString(delegationChainModel.publicKey));
-            var delegations = new List<SignedDelegation>();
-            foreach (var signedDelegationModel in delegationChainModel.delegations)
-            {
-                var pubKey = DerEncodedPublicKey.FromDer(ByteUtil.FromHexString(signedDelegationModel.delegation.pubkey));
-                var expiration = ICTimestamp.FromNanoSeconds(Convert.ToUInt64(signedDelegationModel.delegation.expiration, 16));
-                var delegation = new Delegation(pubKey.Value, expiration);
-
-                var signature = ByteUtil.FromHexString(signedDelegationModel.signature);
-                var signedDelegation = new SignedDelegation(delegation, signature);
-                delegations.Add(signedDelegation);
-            }
-            var delegationChain = new DelegationChain(chainPublicKey, delegations);
-            var delegationIdentity = new DelegationIdentity(TestIdentity, delegationChain);
+            if (DelegationIdentity == null)
+                return;
 
             // Initialize HttpAgent.
-            var agent = new HttpAgent(delegationIdentity);
+            var agent = new HttpAgent(DelegationIdentity);
 
             var canisterId = Principal.FromText(greetBackendCanister);
 
-            // Intialize the client and make the call.
+            // Initialize the client and make the call.
             var client = new GreetingClient.GreetingClient(agent, canisterId);
             var content = await client.Greet();
 
diff --git a/native-apps/unity_ii_deeplink/unity_project/README.md b/native-apps/unity_ii_deeplink/unity_project/README.md
index 6e7725e6d..20d69bcdc 100644
--- a/native-apps/unity_ii_deeplink/unity_project/README.md
+++ b/native-apps/unity_ii_deeplink/unity_project/README.md
@@ -8,7 +8,7 @@ In this example, you can learn how to communicate with the IC from C#. As we des
 1. Provide a plugin to handle the communication between C# and the browser.
 2. Register the DeepLink URL scheme.
 3. Generate the `Ed25519KeyIdentity` in C# and pass the public key to the Web Brower.
-4. Receive the `DelegationIdentity` from the Web Brower and pass it from Java to C#.
+4. Receive the `DelegationChain` from the Web Brower and composite the `DelegationIdentity` from it.
 5. Use the `DelegationIdentity` to communicate with the backend canister.
 
 ## Key Files
@@ -22,7 +22,7 @@ There're several important files in this example.
   This is a Unity post-build processor for iOS platform, which inserts the DeepLink URL scheme into the pList file.
 
 - [DeepLinkPlugin.cs](./Assets/Scripts/DeepLinkPlugin.cs)  
-  It's a plugin which provides functions to open the web browser, handle the DeepLink activation, and parse the delegation from Json string.
+  It's a plugin which provides functions to open the web browser, handle the DeepLink activation, and composite the `DelegationIdentity` from Json string.
 
 - [GreetingClient.cs](./Assets/Scripts/GreetingClient.cs)  
   This provides the C# APIs for calling the Greeting backend canister in [ii_integration_dapp](../ii_integration_dapp/README.md). It can be generated by running the `ClientGenerator` provided by [ICP.NET](https://github.com/BoomDAO/ICP.NET).