add mempool.emzy.de as another broadcaster

src/main/java/com/sparrowwallet/sparrow/net/BroadcastSource.java

@@ -40,6 +40,22 @@ public enum BroadcastSource {
             return postTransactionData(data);
         }
 
+        protected URL getURL(Proxy proxy) throws MalformedURLException {
+            if(Network.get() == Network.MAINNET) {
+                return new URL(getBaseUrl(proxy) + "/api/tx");
+            } else if(Network.get() == Network.TESTNET) {
+                return new URL(getBaseUrl(proxy) + "/testnet/api/tx");
+            } else {
+                throw new IllegalStateException("Cannot broadcast transaction to " + getName() + " on network " + Network.get());
+            }
+        }
+    },
+    MEMPOOL_EMZY_DE("mempool.emzy.de", "https://mempool.emzy.de", "http://mempool4t6mypeemozyterviq3i5de4kpoua65r3qkn5i3kknu5l2cad.onion") {
+        public Sha256Hash broadcastTransaction(Transaction transaction) throws BroadcastException {
+            String data = Utils.bytesToHex(transaction.bitcoinSerialize());
+            return postTransactionData(data);
+        }
+
         protected URL getURL(Proxy proxy) throws MalformedURLException {
             if(Network.get() == Network.MAINNET) {
                 return new URL(getBaseUrl(proxy) + "/api/tx");