diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 3ee68984..255fba25 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -128,11 +128,15 @@ jobs:
       - name: Rename file
         run: mv ${{steps.sign_app.outputs.signedReleaseFile}} dist/cordova/android/apk/release/Sync2-android-${{ steps.vars.outputs.tag }}.apk
 
+      - name: Calculate checksum of output file
+        run: shasum -a 512 dist/cordova/android/apk/release/Sync2-android-${{ steps.vars.outputs.tag }}.apk | cut -f1 -d\ | xxd -r -p | base64 > dist/cordova/android/apk/release/Sync2-android-${{ steps.vars.outputs.tag }}-apk-SHASUM
+
       - name: Upload released files
         uses: softprops/action-gh-release@v1
         with:
           draft: true
           files: |
             dist/cordova/android/apk/release/Sync2-android-${{ steps.vars.outputs.tag }}.apk
+            dist/cordova/android/apk/release/Sync2-android-${{ steps.vars.outputs.tag }}-apk-SHASUM
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/package-lock.json b/package-lock.json
index 25b820fc..598218d2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "org.vechain.sync2",
-  "version": "2.0.3",
+  "version": "2.0.5",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 9dc9d24a..99f193f8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "org.vechain.sync2",
-  "version": "2.0.4",
+  "version": "2.0.5",
   "description": "VeChain Sync2",
   "productName": "Sync2",
   "cordovaId": "org.vechain.sync2",
diff --git a/src/i18n/en-us/index.ts b/src/i18n/en-us/index.ts
index eb3d9ffb..5e3794c3 100644
--- a/src/i18n/en-us/index.ts
+++ b/src/i18n/en-us/index.ts
@@ -179,6 +179,7 @@ export default {
         msg_invalid_request: 'Invalid request',
         msg_fetch_request_failed: 'Unable to fetch request content',
         msg_request_hash_mismatch: 'CAUTION: the request content is corrupted or tampered',
+        msg_fee_delegation: 'Fee will be paid by dApp',
 
         // sign success
         title_success: 'Success',
diff --git a/src/i18n/zh-cn/index.ts b/src/i18n/zh-cn/index.ts
index 06a93e9b..a74f7073 100644
--- a/src/i18n/zh-cn/index.ts
+++ b/src/i18n/zh-cn/index.ts
@@ -178,6 +178,7 @@ export default {
         msg_invalid_request: '无效请求',
         msg_fetch_request_failed: '无法获取请求内容',
         msg_request_hash_mismatch: '注意: 请求内容已损坏或者被篡改',
+        msg_fee_delegation: '费用由应用支付',
 
         // sign success
         title_success: '成功',
diff --git a/src/pages/Sign/GasFeeBar.vue b/src/pages/Sign/GasFeeBar.vue
index 3ab52d67..d1ab5a88 100644
--- a/src/pages/Sign/GasFeeBar.vue
+++ b/src/pages/Sign/GasFeeBar.vue
@@ -17,6 +17,7 @@
                 <q-avatar size="1em">
                     <img src="~assets/vtho.svg">
                 </q-avatar>
+                <q-item-label v-if="isDelegation" caption>{{$t('sign.msg_fee_delegation')}}</q-item-label>
             </q-item-label>
         </q-item-section>
         <q-item-section side>
@@ -33,7 +34,8 @@ import AmountLabel from 'src/components/AmountLabel.vue'
 export default Vue.extend({
     components: { AmountLabel },
     props: {
-        fee: String
+        fee: String,
+        isDelegation: Boolean
     }
 })
 </script>
diff --git a/src/pages/Sign/TxDialog.vue b/src/pages/Sign/TxDialog.vue
index 9397a00a..8cd58a68 100644
--- a/src/pages/Sign/TxDialog.vue
+++ b/src/pages/Sign/TxDialog.vue
@@ -40,7 +40,7 @@
                         @click="showWarnings()"
                     />
 
-                    <gas-fee-bar :fee="fee">
+                    <gas-fee-bar :fee="fee" :isDelegation="isDelegation">
                         <priority-selector
                             v-model="gasPriceCoef"
                             :calcFee="calcFee"
@@ -139,6 +139,9 @@ export default Common.extend({
             this.energyWarning && ret.push(this.energyWarning)
             return ret
         },
+        isDelegation(): boolean {
+            return !!this.req.options.delegator
+        },
         thor(): Connex.Thor { return this.$svc.bc(this.gid).thor },
         estimation(): EstimateGasResult | null {
             if (this.delayedEstimation && this.delayedEstimation.caller === this.signer) {
@@ -170,7 +173,7 @@ export default Common.extend({
         async energyWarning(): Promise<Error | null> {
             const est = this.estimation
             const fee = this.fee
-            if (!est || !fee) {
+            if (!est || !fee || (this.req.options.delegator && !this.req.options.delegator.signer)) {
                 return null
             }
             const signer = this.signer