Zilliqa Blockchain Explorer https://k12.instructure.com/eportfolios/1098588/entries/3707785 So, when there is a lot of transactions inside the mempool and you also paid a relatively minimal transaction charge, your transaction can remain unconfirmed for an prolonged time frame because miners/validators will pick out transactions with increased charges to start with. It is very basic https://bookmarks-hit.com/story24090126/explorer-blockchain-btc-a-simple-key-for-blockchain-explorer-btc-unveiled-https-cutt-ly-3rj9ygbc