[WIP] Add cancel trade feature

core/src/main/java/bisq/core/account/sign/SignedWitnessService.java

@@ -494,7 +494,10 @@ void addToMap(SignedWitness signedWitness) {
     private void publishSignedWitness(SignedWitness signedWitness) {
         if (!signedWitnessMap.containsKey(signedWitness.getHashAsByteArray())) {
             log.info("broadcast signed witness {}", signedWitness.toString());
-            p2PService.addPersistableNetworkPayload(signedWitness, false);
+            // We set reBroadcast to true. The signer has broadcast the signedWitness as
+            // well, so it might be that we have received the data already, but we prefer to re-broadcast
+            // to achieve better resilience.
+            p2PService.addPersistableNetworkPayload(signedWitness, true);
             addToMap(signedWitness);
         }
     }

core/src/main/java/bisq/core/trade/protocol/tasks/seller/SellerMaybeSignWitnessAndSendWitnessMessage.java

@@ -90,7 +90,13 @@ protected void run() {
 
             signedWitness = signedWitnessOptional.get();
 
-            // Message sending is handled in base class.
+            // The signer broadcasts as well the signedWitness. In case the receiver will not get the message we have
+            // better resilience that the data is in the network. We set reBroadcast to true but do not expect that the
+            // signedWitness exists already as we just created it.
+            // TODO check with @sqrrm
+            processModel.getP2PService().addPersistableNetworkPayload(signedWitness, true);
+
+            // Message sending is handled in base class (SendMailboxMessageTask).
             super.run();
         } catch (Throwable t) {
             failed(t);