diff --git a/.ckb-version b/.ckb-version
index 72a8a63..5ee8d4a 100644
--- a/.ckb-version
+++ b/.ckb-version
@@ -1 +1 @@
-0.41.0
+0.42.0-rc1
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 82088b2..f2c2c72 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -32,7 +32,7 @@ jobs:
           macOS     | [Tippy.dmg](https://github.com/nervosnetwork/tippy/releases/download/${{ steps.get_tag.outputs.tag }}/Tippy.dmg) | <code>TODO</code>
           Linux     | [tippy-linux-x64.tar.gz](https://github.com/nervosnetwork/tippy/releases/download/${{ steps.get_tag.outputs.tag }}/tippy-linux-x64.tar.gz) | <code>TODO</code>
         draft: true
-        prerelease: true
+        prerelease: false
     - name: Output upload URL file
       run: echo "${{ steps.create_release.outputs.upload_url }}" > upload_url.txt
     - name: Save upload URL file
diff --git a/README.md b/README.md
index 39b2f9b..9afedce 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,291 @@ brew install gdb --HEAD --build-from-source
 brew install ttyd
 ```
 
+## API
+
+Tippy exposes a set of RPCs in JSON-RPC 2.0 protocols for controlling a devchain.
+
+It also proxies API calls to the active running devchain for transparent CKB interactions.
+
+The URL of Tippy RPC is <code>http://localhost:5000/api</code>.
+
+### CKB RPCs
+
+For CKB RPCs, simply call any API method with Tippy API URL. For example:
+
+```
+echo '{
+  "id": 2,
+  "jsonrpc": "2.0",
+  "method": "get_tip_block_number",
+  "params": []
+}' \
+| tr -d '\n' \
+| curl -H 'content-type: application/json' -d @- \
+http://localhost:5000/api
+```
+
+See [CKB JSON-RPC doc](https://docs.nervos.org/docs/reference/rpc) for more information.
+
+### Tippy RPCs
+
+#### Method `create_chain`
+* `create_chain({assembler_lock_arg, genesis_issued_cells})`
+  * `assembler_lock_arg`(optional): Lock arg for block assembler (miner address).
+  * `genesis_issued_cells`(optional): An array of genesis issued cells. See example for the structure.
+* result: `{ id, name }`
+
+Create a devchain and set it as current active chain.
+
+**Example**
+
+Request
+
+    {
+      "id": "1",
+      "jsonrpc": "2.0",
+      "method": "create_chain",
+      "params": [
+        {
+          "assembler_lock_arg": "0xc8328aabcd9b9e8e64fbc566c4385c3bdeb219d8",
+          "genesis_issued_cells": [
+              {
+                "capacity": "0x5af3107a4000",
+                "lock": {
+                  "code_hash": "0x9bd7e06f3ecf4be0f2fcd2188b23f1b9fcc88e5d4b65a8637b17723bbda3cce8",
+                  "args": "0xf2cb132b2f6849ef8abe57e98cddf713bb8d71cb",
+                  "hash_type": "type"
+                }
+            }
+          ]
+        }
+      ]
+    }
+
+Response
+
+    {
+      "jsonrpc": "2.0",
+      "id": "1",
+      "result": {
+        "id": 4,
+        "name": "CKB devchain"
+      }
+    }
+
+#### Method `start_chain`
+
+* `start_chain()`
+* result: `"ok"`
+
+Start the current active chain.
+
+**Example**
+
+Request
+
+    {
+      "id": "1",
+      "jsonrpc": "2.0",
+      "method": "start_chain",
+      "params": []
+    }
+
+Response
+
+    {
+      "jsonrpc": "2.0",
+      "id": "1",
+      "result": "ok"
+    }
+
+#### Method `stop_chain`
+
+* `stop_chain()`
+* result: `"ok"`
+
+Stop the current active chain if it's running.
+
+**Example**
+
+Request
+
+    {
+      "id": "1",
+      "jsonrpc": "2.0",
+      "method": "stop_chain",
+      "params": []
+    }
+
+Response
+
+    {
+      "jsonrpc": "2.0",
+      "id": "1",
+      "result": "ok"
+    }
+
+#### Method `start_miner`
+
+* `start_miner()`
+* result: `"ok"`
+
+Start the default miner.
+
+**Example**
+
+Request
+
+    {
+      "id": "1",
+      "jsonrpc": "2.0",
+      "method": "start_miner",
+      "params": []
+    }
+
+Response
+
+    {
+      "jsonrpc": "2.0",
+      "id": "1",
+      "result": "ok"
+    }
+
+#### Method `stop_miner`
+
+* `stop_miner()`
+* result: `"ok"`
+
+Stop the current running default miner.
+
+**Example**
+
+Request
+
+    {
+      "id": "1",
+      "jsonrpc": "2.0",
+      "method": "stop_miner",
+      "params": []
+    }
+
+Response
+
+    {
+      "jsonrpc": "2.0",
+      "id": "1",
+      "result": "ok"
+    }
+
+#### Method `mine_blocks`
+
+* `mine_blocks(number_of_blocks)`
+* result: `"Wait for blocks to be mined."`
+
+Mine `number_of_blocks` blocks at the interval of 1 second.
+
+**Example**
+
+Request
+
+    {
+      "id": "1",
+      "jsonrpc": "2.0",
+      "method": "mine_blocks",
+      "params": [3]
+    }
+
+Response
+
+    {
+      "jsonrpc": "2.0",
+      "id": "1",
+      "result": "Wait for blocks to be mined."
+    }
+
+#### Method `revert_blocks`
+
+* `revert_blocks(number_of_blocks)`
+* result: `"Reverted blocks."`
+
+Mine `number_of_blocks` blocks at the interval of 1 second.
+
+**Example**
+
+Request
+
+    {
+      "id": "1",
+      "jsonrpc": "2.0",
+      "method": "revert_blocks",
+      "params": [3]
+    }
+
+Response
+
+    {
+      "jsonrpc": "2.0",
+      "id": "1",
+      "result": "Reverted blocks."
+    }
+
+#### Method `ban_transaction`
+
+* `ban_transaction(tx_hash, type)`
+  * `tx_hash`: Tx hash of the transaction.
+  * `type`: Deny type, `propose` or `commit`.
+* result: `"Added to denylist."`
+
+Add a tx to denylist.
+
+**Example**
+
+Request
+
+    {
+      "id": "1",
+      "jsonrpc": "2.0",
+      "method": "ban_transaction",
+      "params": ["0x9a0580274e9921e04e139214b58ffc60df1625055ab7806ee635b56d329d7732", "propose"]
+    }
+
+Response
+
+    {
+      "jsonrpc": "2.0",
+      "id": "1",
+      "result": "Added to denylist."
+    }
+
+
+#### Method `unban_transaction`
+
+* `unban_transaction(tx_hash, type)`
+  * `tx_hash`: Tx hash of the transaction.
+  * `type`: Deny type, `propose` or `commit`.
+* result: `"Removed from denylist."`
+
+Remove a tx from denylist.
+
+**Example**
+
+Request
+
+    {
+      "id": "1",
+      "jsonrpc": "2.0",
+      "method": "unban_transaction",
+      "params": ["0x9a0580274e9921e04e139214b58ffc60df1625055ab7806ee635b56d329d7732", "propose"]
+    }
+
+Response
+
+    {
+      "jsonrpc": "2.0",
+      "id": "1",
+      "result": "Removed from denylist."
+    }
+
 ## Contributing
 
 1. Fetch the codebase: `git clone https://github.com/nervosnetwork/tippy.git`
diff --git a/src/Tippy.Ctrl/Process/BinariesInfo.cs b/src/Tippy.Ctrl/Process/BinariesInfo.cs
index 2130fa2..a77e1f7 100644
--- a/src/Tippy.Ctrl/Process/BinariesInfo.cs
+++ b/src/Tippy.Ctrl/Process/BinariesInfo.cs
@@ -5,9 +5,8 @@ namespace Tippy.Ctrl.Process
 {
     internal class BinariesInfo
     {
-        internal string Info { get; private set; } = "";
-        internal bool HasDebuggerDeps { get; private set; } = false;
-
+        internal string Info { get; private set; } = "";
+        internal bool HasDebuggerDeps { get; private set; } = false;
         readonly List<string> binaries = new() { "ckb", "ckb-indexer", "ckb-debugger"/*, "ckb-cli"*/ };
 
         internal void Refresh()
@@ -41,32 +40,32 @@ internal void Refresh()
             }
 
             if (!OperatingSystem.IsWindows())
-            {
+            {
                 RefreshDebuggerDeps();
             }
         }
 
-        void RefreshDebuggerDeps()
-        {
-            HasDebuggerDeps = true;
-            // BUGBUG: .Net won't find commands on M1 Mac which has homebrew location at `/opt/homebrew/bin`.
+        void RefreshDebuggerDeps()
+        {
+            HasDebuggerDeps = true;
+            // BUGBUG: .Net won't find commands on M1 Mac which has homebrew location at `/opt/homebrew/bin`.
             foreach (var dep in new List<string>() { "gdb", "ttyd" })
             {
-                try
-                {
-                    System.Diagnostics.Process process = new();
-                    process.StartInfo.UseShellExecute = false;
-                    process.StartInfo.FileName = dep;
-                    process.StartInfo.Arguments = "--version";
-                    process.StartInfo.WorkingDirectory = Core.Environment.GetAppDataFolder();
-                    process.Start();
-                    process.WaitForExit();
+                try
+                {
+                    System.Diagnostics.Process process = new();
+                    process.StartInfo.UseShellExecute = false;
+                    process.StartInfo.FileName = dep;
+                    process.StartInfo.Arguments = "--version";
+                    process.StartInfo.WorkingDirectory = Core.Environment.GetAppDataFolder();
+                    process.Start();
+                    process.WaitForExit();
                 }
                 catch
-                {
-                    HasDebuggerDeps = false;
+                {
+                    HasDebuggerDeps = false;
                 }
-            }
+            }
         }
     }
 }
diff --git a/src/Tippy.Ctrl/Process/CommandProcess.cs b/src/Tippy.Ctrl/Process/CommandProcess.cs
index d4e3c35..549b78d 100644
--- a/src/Tippy.Ctrl/Process/CommandProcess.cs
+++ b/src/Tippy.Ctrl/Process/CommandProcess.cs
@@ -15,7 +15,7 @@ abstract class CommandProcess
 
         internal CommandProcess(ProcessInfo processInfo) => ProcessInfo = processInfo;
 
-        abstract protected void Configure();
+        protected abstract void Configure();
 
         public bool IsRunning
         {
diff --git a/src/Tippy.Ctrl/Process/Debugger/DebuggerProcess.cs b/src/Tippy.Ctrl/Process/Debugger/DebuggerProcess.cs
index 12d9601..c4303f5 100644
--- a/src/Tippy.Ctrl/Process/Debugger/DebuggerProcess.cs
+++ b/src/Tippy.Ctrl/Process/Debugger/DebuggerProcess.cs
@@ -5,12 +5,12 @@ namespace Tippy.Ctrl.Process.Debugger
 {
     internal class DebuggerProcess : CommandProcess
     {
-        private string ScriptHash;
-        private string ScriptGroupType;
-        private string TxFilePath;
-        private string IoType;
-        private int IoIndex;
-        private string? BinaryPath;
+        private readonly string ScriptHash;
+        private readonly string ScriptGroupType;
+        private readonly string TxFilePath;
+        private readonly string IoType;
+        private readonly int IoIndex;
+        private readonly string? BinaryPath;
 
         public DebuggerProcess(ProcessInfo info, string scriptGroupType, string scriptHash, string txFilePath, string ioType, int ioIndex, string? binaryPath = null) : base(info)
         {
diff --git a/src/Tippy.Ctrl/Process/NodeProcess.cs b/src/Tippy.Ctrl/Process/NodeProcess.cs
index bbfe45b..0309bff 100644
--- a/src/Tippy.Ctrl/Process/NodeProcess.cs
+++ b/src/Tippy.Ctrl/Process/NodeProcess.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Globalization;
 using System.IO;
 using System.Linq;
 using System.Reflection;
@@ -96,15 +95,12 @@ void UpdateConfiguration()
 
         string BuildArguments()
         {
-            switch (ProcessInfo.Chain)
+            return ProcessInfo.Chain switch
             {
-                case Core.Models.Project.ChainType.Testnet:
-                    return $"init --chain testnet --ba-arg {ProcessInfo.LockArg}";
-                case Core.Models.Project.ChainType.Mainnet:
-                    return $"init --chain mainnet --ba-arg {ProcessInfo.LockArg}";
-                default:
-                    return $"init --chain dev --ba-arg {ProcessInfo.LockArg} --import-spec -";
-            }
+                Core.Models.Project.ChainType.Testnet => $"init --chain testnet --ba-arg {ProcessInfo.LockArg}",
+                Core.Models.Project.ChainType.Mainnet => $"init --chain mainnet --ba-arg {ProcessInfo.LockArg}",
+                _ => $"init --chain dev --ba-arg {ProcessInfo.LockArg} --import-spec -",
+            };
         }
 
         string ChainSpec()
diff --git a/src/Tippy.Ctrl/ProcessManager.cs b/src/Tippy.Ctrl/ProcessManager.cs
index ebc5de1..46159ff 100644
--- a/src/Tippy.Ctrl/ProcessManager.cs
+++ b/src/Tippy.Ctrl/ProcessManager.cs
@@ -31,7 +31,7 @@ public enum MinerMode
             Sophisticated,
         }
 
-        static List<ProcessGroup> processGroups = new List<ProcessGroup>();
+        static readonly List<ProcessGroup> processGroups = new();
 
         static ProcessGroup? GroupFor(Project project) =>
             processGroups.Find(g => g.ProcessInfo == ProcessInfo.FromProject(project));
diff --git a/src/Tippy/Api/TippyRpc.cs b/src/Tippy/Api/TippyRpc.cs
index cd1a1e6..fc42d63 100644
--- a/src/Tippy/Api/TippyRpc.cs
+++ b/src/Tippy/Api/TippyRpc.cs
@@ -29,7 +29,18 @@ public TippyRpc(TippyDbContext context)
 
         readonly TippyDbContext dbContext;
 
-        readonly HashSet<string> methods = new() { "create_chain", "start_chain", "stop_chain", "mine_blocks", "revert_blocks" };
+        readonly HashSet<string> methods = new()
+        {
+            "create_chain",
+            "start_chain",
+            "stop_chain",
+            "start_miner",
+            "stop_miner",
+            "mine_blocks",
+            "revert_blocks",
+            "ban_transaction",
+            "unban_transaction",
+        };
 
         [HttpPost]
         public ActionResult Index()
@@ -94,8 +105,12 @@ internal async Task<object> Handle()
                 "create_chain" => await CreateChain(),
                 "start_chain" => StartChain(),
                 "stop_chain" => StopChain(),
+                "start_miner" => StartMiner(),
+                "stop_miner" => StopMiner(),
                 "mine_blocks" => MineBlocks(),
                 "revert_blocks" => RevertBlocks(),
+                "ban_transaction" => await BanTransaction(),
+                "unban_transaction" => await UnbanTransaction(),
                 // TODO: other apis
                 _ => "TODO",
             };
@@ -180,6 +195,40 @@ object StopChain()
             return "ok";
         }
 
+        // Start the default miner
+        object StartMiner()
+        {
+            if (project == null)
+            {
+                throw new Exception("No active chain. Create a chain first.");
+            }
+
+            if (!ProcessManager.IsRunning(project))
+            {
+                throw new Exception("Active chain is not running.");
+            }
+
+            ProcessManager.StartMiner(project, ProcessManager.MinerMode.Default);
+            return "ok";
+        }
+
+        // Stop the running default miner
+        object StopMiner()
+        {
+            if (project == null)
+            {
+                throw new Exception("No active chain. Create a chain first.");
+            }
+
+            if (!ProcessManager.IsRunning(project))
+            {
+                throw new Exception("Active chain is not running.");
+            }
+
+            ProcessManager.StopMiner(project);
+            return "ok";
+        }
+
         // Mine N blocks at the default 1sec interval.
         object MineBlocks()
         { 
@@ -254,6 +303,74 @@ object RevertBlocks()
 
             return "Reverted blocks.";
         }
+
+        // Add a transaction to denylist
+        async Task<object> BanTransaction()
+        {
+            if (project == null)
+            {
+                throw new Exception("No active chain. Create a chain first.");
+            }
+
+            if (request.Params == null || request.Params.Length != 2)
+            {
+                throw new Exception("Must provide params as tx hash and deny type.");
+            }
+
+            var txHash = request.Params[0].ToString()!;
+            var type = request.Params[1].ToString()!;
+            try
+            {
+                var item = new DeniedTransaction
+                {
+                    ProjectId = project.Id,
+                    TxHash = txHash,
+                    DenyType = type == "propose" ? DeniedTransaction.Type.Propose : DeniedTransaction.Type.Commit
+                };
+                dbContext.DeniedTransactions.Add(item);
+                await dbContext.SaveChangesAsync();
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+            }
+            return "Added to denylist.";
+        }
+
+        // Remove a transaction from denylist
+        async Task<object> UnbanTransaction()
+        {
+            if (project == null)
+            {
+                throw new Exception("No active chain. Create a chain first.");
+            }
+
+            if (request.Params == null || request.Params.Length != 2)
+            {
+                throw new Exception("Must provide params as tx hash and deny type.");
+            }
+
+            var txHash = request.Params[0].ToString()!;
+            var type = request.Params[1].ToString()!;
+            try
+            {
+                var denyType = type == "propose" ? DeniedTransaction.Type.Propose : DeniedTransaction.Type.Commit;
+                var item = dbContext
+                    .DeniedTransactions
+                    .Where(t => t.TxHash == txHash && t.DenyType == denyType)
+                    .First();
+                if (item != null)
+                {
+                    dbContext.DeniedTransactions.Remove(item);
+                    await dbContext.SaveChangesAsync();
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+            }
+            return "Removed from denylist.";
+        }
     }
 
     class RequestObject
diff --git a/src/Tippy/Pages/Doc/Api.cshtml b/src/Tippy/Pages/Doc/Api.cshtml
deleted file mode 100644
index b6715d2..0000000
--- a/src/Tippy/Pages/Doc/Api.cshtml
+++ /dev/null
@@ -1,172 +0,0 @@
-@page
-@model Tippy.Pages.Doc.ApiModel
-@{ ViewData["Title"] = "RPC API"; }
-
-<h1 class="title">RPC API</h1>
-
-<style>
-    code {
-        color: white;
-    }
-</style>
-
-<div class="content">
-    <p>
-        Tippy exposes a set of RPCs in JSON-RPC 2.0 protocols for controlling a devchain.
-        It also proxies API calls to the active running devchain for transparent CKB interactions.
-    </p>
-
-    <p>
-        The URL of Tippy RPC is <code>http://localhost:5000/api</code>.
-    </p>
-
-    <h2 class="title is-4">CKB RPCs</h2>
-
-    <p>
-        For CKB RPCs, simply call any API with Tippy API URL. For example:
-    </p>
-
-    <pre class="has-background-dark"><code>echo '{
-    "id": 2,
-    "jsonrpc": "2.0",
-    "method": "get_tip_block_number",
-    "params": []
-}' \
-| tr -d '\n' \
-| curl -H 'content-type: application/json' -d @@- \
-http://localhost:5000/api</code></pre>
-
-    <p>See <a href="https://docs.nervos.org/docs/reference/rpc" target="_blank">CKB JSON-RPC doc</a> for more information.</p>
-
-    <h2 class="title is-4">Tippy RPCs</h2>
-
-    <h4 class="title">Method <code>create_chain</code></h4>
-    <ul>
-        <li><code>create_chain({assembler_lock_arg, genesis_issued_cells})</code></li>
-        <li>
-            <ul>
-                <li><code>assember_lock_arg</code>(optional): Lock arg for block assembler (miner address).</li>
-                <li><code>genesis_issued_cells</code>(optional): An array of genesis issued cells. See example for the structure.</li>
-            </ul>
-        </li>
-        <li>result: <code>{ id, name }</code></li>
-    </ul>
-    <p>Create a devchain and set it as current active chain.</p>
-    <h5 class="title">Examples</h5>
-    <p>Request</p>
-    <pre class="has-background-dark"><code>{
-    "id": "1",
-    "jsonrpc": "2.0",
-    "method": "create_chain",
-    "params": [
-        {
-            "assembler_lock_arg": "0xc8328aabcd9b9e8e64fbc566c4385c3bdeb219d8",
-            "genesis_issued_cells": [
-                {
-                    "capacity": "0x5af3107a4000",
-                    "lock": {
-                        "code_hash": "0x9bd7e06f3ecf4be0f2fcd2188b23f1b9fcc88e5d4b65a8637b17723bbda3cce8",
-                        "args": "0xf2cb132b2f6849ef8abe57e98cddf713bb8d71cb",
-                        "hash_type": "type"
-                    }
-                }
-            ]
-        }
-    ]
-}
-</code></pre>
-    <p>Response</p>
-    <pre class="has-background-dark"><code>{
-    "jsonrpc": "2.0",
-    "id": "1",
-    "result": {
-      "id": 4,
-      "name": "CKB devchain"
-    } 
-}</code></pre>
-
-    <h4 class="title">Method <code>start_chain</code></h4>
-    <ul>
-        <li><code>start_chain()</code></li>
-        <li>result: <code>"ok"</code></li>
-    </ul>
-    <p>Start the current active chain.</p>
-    <h5 class="title">Examples</h5>
-    <p>Request</p>
-    <pre class="has-background-dark"><code>{
-    "id": "1",
-    "jsonrpc": "2.0",
-    "method": "start_chain",
-    "params": []
-}</code></pre>
-    <p>Response</p>
-    <pre class="has-background-dark"><code>{
-    "jsonrpc": "2.0",
-    "id": "1",
-    "result": "ok"
-}</code></pre>
-
-    <h4 class="title">Method <code>stop_chain</code></h4>
-    <ul>
-        <li><code>stop_chain()</code></li>
-        <li>result: <code>"ok"</code></li>
-    </ul>
-    <p>Stop the current active chain if it's running.</p>
-    <h5 class="title">Examples</h5>
-    <p>Request</p>
-    <pre class="has-background-dark"><code>{
-    "id": "1",
-    "jsonrpc": "2.0",
-    "method": "stop_chain",
-    "params": []
-}</code></pre>
-    <p>Response</p>
-    <pre class="has-background-dark"><code>{
-    "jsonrpc": "2.0",
-    "id": "1",
-    "result": "ok"
-}</code></pre>
-
-    <h4 class="title">Method <code>mine_blocks</code></h4>
-    <ul>
-        <li><code>mine_blocks(number_of_blocks)</code></li>
-        <li>result: <code>"Wait for blocks to be mined."</code></li>
-    </ul>
-    <p>Mine <code>number_of_blocks</code> blocks at the interval of 1 second.</p>
-    <h5 class="title">Examples</h5>
-    <p>Request</p>
-    <pre class="has-background-dark"><code>{
-    "id": "1",
-    "jsonrpc": "2.0",
-    "method": "mine_blocks",
-    "params": [3]
-}</code></pre>
-    <p>Response</p>
-    <pre class="has-background-dark"><code>{
-    "jsonrpc": "2.0",
-    "id": "1",
-    "result": "Wait for blocks to be mined."
-}</code></pre>
-
-    <h4 class="title">Method <code>revert_blocks</code></h4>
-    <ul>
-        <li><code>revert_blocks(number_of_blocks)</code></li>
-        <li>result: <code>"Reverted blocks."</code></li>
-    </ul>
-    <p>Mine <code>number_of_blocks</code> blocks at the interval of 1 second.</p>
-    <h5 class="title">Examples</h5>
-    <p>Request</p>
-    <pre class="has-background-dark"><code>{
-    "id": "1",
-    "jsonrpc": "2.0",
-    "method": "revert_blocks",
-    "params": [3]
-}</code></pre>
-    <p>Response</p>
-    <pre class="has-background-dark"><code>{
-    "jsonrpc": "2.0",
-    "id": "1",
-    "result": "Reverted blocks."
-}</code></pre>
-
-</div>
diff --git a/src/Tippy/Pages/Doc/Api.cshtml.cs b/src/Tippy/Pages/Doc/Api.cshtml.cs
deleted file mode 100644
index 09ad9e6..0000000
--- a/src/Tippy/Pages/Doc/Api.cshtml.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-using System;
-
-namespace Tippy.Pages.Doc
-{
-    public class ApiModel : PageModelBase
-    {
-        public ApiModel(Tippy.Core.Data.TippyDbContext context) : base(context)
-        {
-        }
-
-        public void OnGet()
-        {
-        }
-    }
-}
diff --git a/src/Tippy/Pages/Home/Index.cshtml b/src/Tippy/Pages/Home/Index.cshtml
index 4560be0..bec25af 100644
--- a/src/Tippy/Pages/Home/Index.cshtml
+++ b/src/Tippy/Pages/Home/Index.cshtml
@@ -59,7 +59,7 @@
                 <div class="title is-5">@Model.ActiveProject.Chain.ToString().ToLower()</div>
                 <div class="heading">CKB RPC</div>
                 <div class="title is-5">http://localhost:@Model.ActiveProject.NodeRpcPort</div>
-                <div class="heading">Tippy RPC (<a asp-page="/Doc/Api" style="text-transform: none;">document</a>)</div>
+                <div class="heading">Tippy RPC (<a href="https://github.com/nervosnetwork/tippy#api" target="_blank" style="text-transform: none;">document</a>)</div>
                 <div class="title is-5">http://localhost:5000/api</div>
             </div>
         </div>
diff --git a/src/Tippy/Pages/Home/_EpochInfo.cshtml b/src/Tippy/Pages/Home/_EpochInfo.cshtml
index cfe4011..3d2f428 100644
--- a/src/Tippy/Pages/Home/_EpochInfo.cshtml
+++ b/src/Tippy/Pages/Home/_EpochInfo.cshtml
@@ -3,12 +3,12 @@
 
 <div class="box" style="background-color: #6C5054">
     <div class="heading">Epoch</div>
-    <div class="title">@Hex.HexToUInt64(Model.EpochView!.Number)</div>
+    <div class="title">@Hex.HexToUInt64(Model.EpochView?.Number ?? "0x0")</div>
     <div class="heading">Block Index</div>
-    @{ var current = Model.TipBlockNumber - Hex.HexToUInt64(Model.EpochView!.StartNumber) + 1; }
+    @{ var current = Model.TipBlockNumber - Hex.HexToUInt64(Model.EpochView?.StartNumber ?? "0x0") + 1; }
     <div class="title is-5">@current</div>
     <div class="heading">Length</div>
-    <div class="title is-5">@Hex.HexToUInt64(Model.EpochView!.Length)</div>
+    <div class="title is-5">@Hex.HexToUInt64(Model.EpochView?.Length ?? "0x0")</div>
     <div class="heading">Compact Target</div>
-    <div class="title is-5">@Hex.HexToUInt32(Model.EpochView!.CompactTarget)</div>
+    <div class="title is-5">@Hex.HexToUInt32(Model.EpochView?.CompactTarget ?? "0x0")</div>
 </div>
diff --git a/src/Tippy/Tippy.csproj b/src/Tippy/Tippy.csproj
index 773a9a6..6d1aae1 100644
--- a/src/Tippy/Tippy.csproj
+++ b/src/Tippy/Tippy.csproj
@@ -8,7 +8,7 @@
     <IsPackable>false</IsPackable>
     <DebugType>embedded</DebugType>
     <UserSecretsId>6e0dc08b-01f2-47f6-8249-66ed1b18f469</UserSecretsId>
-    <Version>0.2.1</Version>
+    <Version>0.2.2</Version>
     <PackageProjectUrl>https://github.com/nervosnetwork/tippy</PackageProjectUrl>
     <RepositoryUrl>https://github.com/nervosnetwork/tippy</RepositoryUrl>
     <Copyright>Copyright (c) Nervos Foundation</Copyright>
diff --git a/tools/osx/Info.plist b/tools/osx/Info.plist
index ec3f194..61582eb 100644
--- a/tools/osx/Info.plist
+++ b/tools/osx/Info.plist
@@ -9,9 +9,9 @@
     <key>CFBundleIconFile</key>
     <string>Tippy.icns</string>
     <key>CFBundleVersion</key>
-    <string>0.2.1</string>
+    <string>0.2.2</string>
     <key>CFBundleShortVersionString</key>
-    <string>0.2.1</string>
+    <string>0.2.2</string>
     <key>CFBundleExecutable</key>
     <string>main</string>
     <key>CFBundleInfoDictionaryVersion</key>