diff --git a/meerkat-common/src/main/proto/meerkat/voting.proto b/meerkat-common/src/main/proto/meerkat/voting.proto
index c253a88..0c2963c 100644
--- a/meerkat-common/src/main/proto/meerkat/voting.proto
+++ b/meerkat-common/src/main/proto/meerkat/voting.proto
@@ -60,9 +60,9 @@ message BallotAnswer {
 }
 
 message PlaintextBallot {
-    uint64 serialNumber = 1; // Ballot serial number
-
-    repeated BallotAnswer answers = 2;
+    uint64 serial_number = 1; // Ballot serial number
+    bytes channel_identifier = 2;
+    repeated BallotAnswer answers = 3;
 }
 
 message EncryptedBallot {
diff --git a/voting-booth/src/main/java/meerkat/voting/output/NetworkVirtualPrinter.java b/voting-booth/src/main/java/meerkat/voting/output/NetworkVirtualPrinter.java
index 6ec2583..74f9970 100644
--- a/voting-booth/src/main/java/meerkat/voting/output/NetworkVirtualPrinter.java
+++ b/voting-booth/src/main/java/meerkat/voting/output/NetworkVirtualPrinter.java
@@ -1,6 +1,7 @@
 package meerkat.voting.output;
 
 import com.google.protobuf.BoolValue;
+import com.google.protobuf.ByteString;
 import meerkat.protobuf.PollingStation.ScannedData;
 import meerkat.protobuf.Voting.SignedEncryptedBallot;
 import meerkat.rest.Constants;
@@ -10,10 +11,7 @@ import meerkat.voting.output.outputcommands.*;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.ws.rs.client.Client;
-import javax.ws.rs.client.ClientBuilder;
-import javax.ws.rs.client.Entity;
-import javax.ws.rs.client.WebTarget;
+import javax.ws.rs.client.*;
 import javax.ws.rs.core.Response;
 import java.io.IOException;
 
@@ -25,6 +23,7 @@ import static meerkat.pollingstation.PollingStationConstants.POLLING_STATION_WEB
 public class NetworkVirtualPrinter extends AsyncRunnableOutputDevice {
 
     private static final Logger logger = LoggerFactory.getLogger(NetworkVirtualPrinter.class);
+    private ByteString channelIdentifier;
     private SignedEncryptedBallot signedEncryptedBallot;
     private final WebTarget successfulPrintTarget;
 
@@ -35,6 +34,7 @@ public class NetworkVirtualPrinter extends AsyncRunnableOutputDevice {
         client.register(ProtobufMessageBodyReader.class);
         client.register(ProtobufMessageBodyWriter.class);
         successfulPrintTarget = client.target(address).path(POLLING_STATION_WEB_SCANNER_SCAN_PATH);
+        resetState();
     }
 
 
@@ -46,6 +46,7 @@ public class NetworkVirtualPrinter extends AsyncRunnableOutputDevice {
      */
     public void doCommitToBallot(CommitOutputCommand command) {
         logger.debug("entered method doCommitToBallot");
+        channelIdentifier = command.getChannelIdentifierByteString();
         signedEncryptedBallot = command.getSignedEncryptedBallot();
         command.getCallback().onSuccess(null);
     }
@@ -57,7 +58,7 @@ public class NetworkVirtualPrinter extends AsyncRunnableOutputDevice {
      */
     public void doAudit(AuditOutputCommand command) {
         logger.debug("entered method doAudit");
-        signedEncryptedBallot = null;
+        resetState();
         command.getCallback().onSuccess(null);
     }
 
@@ -69,7 +70,7 @@ public class NetworkVirtualPrinter extends AsyncRunnableOutputDevice {
     public void doCastBallot(CastOutputCommand command) {
         logger.debug("entered method doCastBallot");
         ScannedData scannedData = ScannedData.newBuilder()
-                .setChannel(null)  //TODO: fill the details for the channel to be able to send here
+                .setChannel(channelIdentifier)
                 .setSignedEncryptedBallot(this.signedEncryptedBallot)
                 .build();
 
@@ -77,6 +78,8 @@ public class NetworkVirtualPrinter extends AsyncRunnableOutputDevice {
         BoolValue b = response.readEntity(BoolValue.class);
         response.close();
 
+        resetState();
+
         if (b.getValue()) {
             command.getCallback().onSuccess(null);
         }
@@ -92,8 +95,14 @@ public class NetworkVirtualPrinter extends AsyncRunnableOutputDevice {
      */
     public void doCancel(CancelOutputCommand command) {
         logger.debug("entered method doCancel");
-        signedEncryptedBallot = null;
+        resetState();
         command.getCallback().onSuccess(null);
     }
 
+
+    private void resetState() {
+        channelIdentifier = null;
+        signedEncryptedBallot = null;
+    }
+
 }
diff --git a/voting-booth/src/main/java/meerkat/voting/output/SystemConsoleOutputDevice.java b/voting-booth/src/main/java/meerkat/voting/output/SystemConsoleOutputDevice.java
index daf468e..4f50c27 100644
--- a/voting-booth/src/main/java/meerkat/voting/output/SystemConsoleOutputDevice.java
+++ b/voting-booth/src/main/java/meerkat/voting/output/SystemConsoleOutputDevice.java
@@ -29,7 +29,10 @@ public class SystemConsoleOutputDevice extends AsyncRunnableOutputDevice {
         logger.debug("entered method doCommitToBallot");
         PlaintextBallot plaintextBallot = command.getPlaintext();
         long plaintextSerialNumber = plaintextBallot.getSerialNumber();
-        System.out.println("Commitment of Ballot #" + plaintextSerialNumber + " (plaintext):");
+        System.out.println("Commitment of Ballot #" + plaintextSerialNumber);
+        System.out.println("(channel): ");
+        System.out.println(bytesToString(command.getChannelIdentifierByteString()));
+        System.out.println("(plaintext): ");
         System.out.println(plaintextBallot);
         SignedEncryptedBallot signedEncryptedBallot = command.getSignedEncryptedBallot();
         long encryptedSerialNumber = signedEncryptedBallot.getEncryptedBallot().getSerialNumber();
diff --git a/voting-booth/src/main/java/meerkat/voting/output/outputcommands/CommitOutputCommand.java b/voting-booth/src/main/java/meerkat/voting/output/outputcommands/CommitOutputCommand.java
index 5bec550..42c9307 100644
--- a/voting-booth/src/main/java/meerkat/voting/output/outputcommands/CommitOutputCommand.java
+++ b/voting-booth/src/main/java/meerkat/voting/output/outputcommands/CommitOutputCommand.java
@@ -1,5 +1,6 @@
 package meerkat.voting.output.outputcommands;
 
+import com.google.protobuf.ByteString;
 import meerkat.protobuf.Voting.*;
 import meerkat.voting.controller.callbacks.ControllerCallback;
 
@@ -19,6 +20,10 @@ public class CommitOutputCommand extends OutputCommand<Void> {
         this.signedEncryptedBallot = signedEncryptedBallot;
     }
 
+    public ByteString getChannelIdentifierByteString() {
+        return plaintextBallot.getChannelIdentifier();
+    }
+
     public PlaintextBallot getPlaintext() {
         return plaintextBallot;
     }