Q Blockchain Explorer https://500px.com/p/enevoldsenepbhenderson So, when there is a lot of transactions inside the mempool and you compensated a relatively minimal transaction charge, your transaction can remain unconfirmed for an prolonged timeframe given that miners/validators will select transactions with bigger costs initial. The mempool mainly queues the transaction and broadcasts https://intensedebate.com/people/mcculloughfour