diff --git a/CA-Platform-Linker/Models/Coss/CossModels.cs b/CA-Platform-Linker/Models/Coss/CossModels.cs
index 56a1b87..34e4029 100644
--- a/CA-Platform-Linker/Models/Coss/CossModels.cs
+++ b/CA-Platform-Linker/Models/Coss/CossModels.cs
@@ -75,4 +75,22 @@ namespace CA_Platform_Linker.Models.Coss
         public string oriData { get; set; }
         public string attachCert { get; set; }
     }
+
+    /// <summary>
+    /// 验时间戳返回数据
+    /// </summary>
+    public class CossVerifyResultData
+    {
+        /// <summary>
+        /// 验签结果：1=通过，-1=时间戳验证不通过，-2=原文验证不通过，-3=不是所信任的根，-4=证书未生效，-5=查询不到此证书，-6=服务器证书过期
+        /// </summary>
+        public int verifyRes { get; set; }
+        public string verifyMsg { get; set; }
+    }
+
+    public class VerifyTssRequest : CossBaseRequest
+    {
+        public string oriData { get; set; }
+        public string tsResp { get; set; }
+    }
 }
diff --git a/CA-Platform-Linker/Services/ClientService.cs b/CA-Platform-Linker/Services/ClientService.cs
index 641b995..50ca5aa 100644
--- a/CA-Platform-Linker/Services/ClientService.cs
+++ b/CA-Platform-Linker/Services/ClientService.cs
@@ -90,10 +90,33 @@ namespace CA_Platform_Linker.Services
 
                 if (result.status == "200")
                 {
-                    _ = Task.Run(() =>
+                    _ = Task.Run(async () =>
                     {
+                        string tsData = "";
                         try
                         {
+                            // 1. 协同加盖时间戳
+                            var createTssRes = await CreateTssAsync(clientType, base64Data);
+                            if (createTssRes.status != "200" || string.IsNullOrEmpty(createTssRes.data?.tsResp))
+                            {
+                                string errMsg = $"加盖时间戳失败: {createTssRes.message ?? "tsResp为空"}";
+                                LogHelper.Log.Error(errMsg);
+                                return;
+                            }
+                            tsData = createTssRes.data.tsResp;
+                            LogHelper.Log.Info($"加盖时间戳成功，SignDataId: {result.data.signDataId}");
+
+                            // 2. 时间戳验签
+                            var verifyTssRes = await VerifyTssAsync(clientType, base64Data, tsData);
+                            if (verifyTssRes.status != "200" || verifyTssRes.data?.verifyRes != 1)
+                            {
+                                string errMsg = $"时间戳验签失败: {verifyTssRes.message ?? verifyTssRes.data?.verifyMsg ?? "未知错误"}";
+                                LogHelper.Log.Error(errMsg);
+                                return;
+                            }
+                            LogHelper.Log.Info($"时间戳验签通过，SignDataId: {result.data.signDataId}");
+
+                            // 3. 验签通过，写入数据库
                             var clientConfig = ConfigHelper.GetCossClientConfig(clientType);
                             var (operCode, operName) = SqlHelper.GetOperatorInfo(userId);
                             var signInfo = new SignInfo
@@ -106,10 +129,10 @@ namespace CA_Platform_Linker.Services
                                 OperCode = operCode ?? "",
                                 OperName = operName ?? "",
                                 SignDate = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"),
-                                CertID = "",
+                                CertID = result.data.msspId ?? "",
                                 OperCert = result.data.signCert,
                                 SignData = result.data.signResult,
-                                TSData = "",
+                                TSData = tsData,
                                 SignID = signID,
                                 OperType = clientType + "自动签名",
                                 SignWay = 1
@@ -120,7 +143,7 @@ namespace CA_Platform_Linker.Services
                         }
                         catch (Exception ex)
                         {
-                            LogHelper.Log.Error($"写入签名记录失败：{ex.Message}");
+                            LogHelper.Log.Error($"签名后处理流程异常：{ex.Message}");
                         }
                     });
                 }
@@ -156,5 +179,51 @@ namespace CA_Platform_Linker.Services
                 };
             }
         }
+
+        /// <summary>
+        /// 协同加盖时间戳（参考Demo: createAndGetTssInfo）
+        /// </summary>
+        public async Task<CossResponse<CossResultData>> CreateTssAsync(string clientType, string oriData)
+        {
+            try
+            {
+                Hashtable ht = CossHelper.BuildBaseHashtable(clientType);
+                ht.Add("oriData", oriData);
+                ht.Add("attachCert", "true");
+                return await CossHelper.PostAsync<CossResultData>("createAndGetTssInfo", ht, clientType);
+            }
+            catch (Exception ex)
+            {
+                LogHelper.Log.Error($"加盖时间戳失败: {ex.Message}");
+                return new CossResponse<CossResultData>
+                {
+                    status = "500",
+                    message = ex.Message
+                };
+            }
+        }
+
+        /// <summary>
+        /// 时间戳验签（参考Demo: verifyTS）
+        /// </summary>
+        public async Task<CossResponse<CossVerifyResultData>> VerifyTssAsync(string clientType, string oriData, string tsResp)
+        {
+            try
+            {
+                Hashtable ht = CossHelper.BuildBaseHashtable(clientType);
+                ht.Add("oriData", oriData);
+                ht.Add("tsResp", tsResp);
+                return await CossHelper.PostAsync<CossVerifyResultData>("verifyTS", ht, clientType);
+            }
+            catch (Exception ex)
+            {
+                LogHelper.Log.Error($"时间戳验签失败: {ex.Message}");
+                return new CossResponse<CossVerifyResultData>
+                {
+                    status = "500",
+                    message = ex.Message
+                };
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/CA-Platform-Linker/Services/Interfaces/IClientService.cs b/CA-Platform-Linker/Services/Interfaces/IClientService.cs
index 8f606cf..f460a15 100644
--- a/CA-Platform-Linker/Services/Interfaces/IClientService.cs
+++ b/CA-Platform-Linker/Services/Interfaces/IClientService.cs
@@ -12,5 +12,15 @@ namespace CA_Platform_Linker.Services.Interfaces
         Task<CossResponse<CossResultData>> AddSignJobAsync(string clientType, string title, string data, string userId = "", string algo = "SM3withSM2", string expiryDate = "1400");
         Task<CossResponse<CossResultData>> AutoSignAsync(string clientType, string userId, string signToken, string data, string algo = "SM3withSM2", string expiryDate = "1400", int mzNum = 0, int zyNum = 0, string signID = "", int clientOper = 0);
         Task<CossResponse<CossResultData>> GetSignResultAsync(string clientType, string signDataId);
+
+        /// <summary>
+        /// 协同加盖时间戳（参考Demo: createAndGetTssInfo）
+        /// </summary>
+        Task<CossResponse<CossResultData>> CreateTssAsync(string clientType, string oriData);
+
+        /// <summary>
+        /// 时间戳验签（参考Demo: verifyTS）
+        /// </summary>
+        Task<CossResponse<CossVerifyResultData>> VerifyTssAsync(string clientType, string oriData, string tsResp);
     }
 }
\ No newline at end of file