diff --git a/README.md b/README.md
index 9f51ec6..0e47137 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,11 @@ Alternatively, you can use an offline mock, which replicates the NLX environment
 1. Run `docker-compose -f docker-compose-travis.yml up`
 
 # Running validator
-The validator app is made with [Expo](https://expo.io/), which is a free and open-source react-native framework for mobile development. to run this on a mobile device, connect to the same network without firewall restrictions (if all else fails, starting an hotspot on your mobile device and connecting to it usually works). In the folder "validator-frontend", issue the command:
+The validator app is made with [Expo](https://expo.io/), which is a free and open-source react-native framework for mobile development. to run this on a mobile device, the expo-cli tool is required. to install this, run:
+```bash
+$npm install -g expo-cli
+```
+connect to the same network without firewall restrictions (if all else fails, starting an hotspot on your mobile device and connecting to it usually works). In the folder "validator-frontend", issue the command:
 ```bash
 $expo start
 ```
diff --git a/validator-frontend/screens/ScanScreen.js b/validator-frontend/screens/ScanScreen.js
index 1a43092..fe6b3b5 100644
--- a/validator-frontend/screens/ScanScreen.js
+++ b/validator-frontend/screens/ScanScreen.js
@@ -24,14 +24,6 @@ class ScanScreen extends React.Component {
     this.setState({ hasCameraPermission: status === 'granted' });
   }
 
-  _storeData = async (data) => {
-    try {
-      await AsyncStorage.setItem("BRP1", data);
-    } catch (error) {
-      console.log(error.message)
-    }
-  }
-
   render() {
     const { hasCameraPermission } = this.state;
 
@@ -52,8 +44,6 @@ class ScanScreen extends React.Component {
   }
 
   handleBarCodeScanned = ({ type, data }) => {
-    this._storeData(data)
-    console.log(data);
     this.props.navigation.navigate('Validating', {qrString: data})
   }
 }
@@ -66,6 +56,13 @@ class ValidatingScreen extends Component {
   static navigationOptions = {
     headerTitle: 'Validating screen',
   };
+  _storeData = async (data) => {
+    try {
+      await AsyncStorage.setItem("BRP1", data);
+    } catch (error) {
+      console.log(error.message)
+    }
+  }
   async _checkQR() {
     const { navigation } = this.props;
     const qrString = await navigation.getParam('qrString', 'String not found');
@@ -104,16 +101,9 @@ class ValidatingScreen extends Component {
       '   eyB5  '  +
       '   -----END CERTIFICATE-----  '  +
       '    ' ;
-    let documentJson = JSON.parse(qrString);
-    let claimWithLink = Object.values(documentJson)[0][0];
-    let claimData = Object.values(claimWithLink)[0];
-    let tempdata = claimData[0];
-    let moredata = Object.values(tempdata)[0];
-    console.log(moredata);
     paperWallet.getCore().registerConnector('ephemeral', new EphemeralConnector())
     let attestorSsid = await (await paperWallet.getCore().getConnector('ephemeral')).newIdentity({'cert': cert})
-    let validatorSsid = await paperWallet.getCore().newSsid('ephemeral')
-    this.result = await paperWallet.validate(attestorSsid.did, qrString, validatorSsid.did)
+    this.result = await paperWallet.validate(attestorSsid.did, qrString)
     console.log(this.result)
   }
 
@@ -125,6 +115,7 @@ class ValidatingScreen extends Component {
     }
     else if(this.result == true){
       this.setState({validatingState: "verified"})
+      this._storeData(this.qrString)
     }
   };