diff --git a/backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/data/repository/TssRepository.kt b/backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/data/repository/TssRepository.kt
index a585a8da..1b970e0a 100644
--- a/backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/data/repository/TssRepository.kt
+++ b/backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/data/repository/TssRepository.kt
@@ -1695,9 +1695,11 @@ class TssRepository @Inject constructor(
                 }
 
                 // Build request body matching account-service API
+                // Note: Android ShareRecordEntity doesn't store wallet_name, use address-based name
+                val walletName = "Wallet ${shareEntity.address.take(8)}...${shareEntity.address.takeLast(4)}"
                 val requestBody = com.google.gson.JsonObject().apply {
                     addProperty("keygen_session_id", shareEntity.sessionId)
-                    addProperty("wallet_name", shareEntity.walletName)
+                    addProperty("wallet_name", walletName)
                     addProperty("message_hash", messageHash)
                     add("parties", partiesArray)
                     addProperty("threshold_t", shareEntity.thresholdT)
diff --git a/backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/viewmodel/MainViewModel.kt b/backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/viewmodel/MainViewModel.kt
index 16c28f1c..d83cf128 100644
--- a/backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/viewmodel/MainViewModel.kt
+++ b/backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/viewmodel/MainViewModel.kt
@@ -3,6 +3,7 @@ package com.durian.tssparty.presentation.viewmodel
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.durian.tssparty.data.repository.JoinKeygenViaGrpcResult
+import com.durian.tssparty.data.repository.Participant
 import com.durian.tssparty.data.repository.TssRepository
 import com.durian.tssparty.domain.model.*
 import com.durian.tssparty.util.AddressUtils
@@ -1221,7 +1222,7 @@ data class CoSignSessionInfo(
     val thresholdT: Int,
     val thresholdN: Int,
     val currentParticipants: Int,
-    val parties: List<com.durian.tssparty.data.repository.Participant> = emptyList()  // Complete parties list from API
+    val parties: List<Participant> = emptyList()  // Complete parties list from API
 )
 
 /**