reverse order of mempool txs

Author: SomberNight

src/electrumx/server/mempool.py

@@ -424,7 +424,7 @@ async def transaction_summaries(self, hashX):
             tx = self.txs[tx_hash]
             has_ui = any(hash in self.txs for hash, idx in tx.prevouts)
             result.append(MemPoolTxSummary(tx_hash, tx.fee, has_ui))
-        result.sort(key=lambda x: (x.has_unconfirmed_inputs, x.hash))
+        result.sort(key=lambda x: (x.has_unconfirmed_inputs, x.hash[::-1]))
         return result
 
     async def unordered_UTXOs(self, hashX):