Open Source Blockchain Explorer http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=3670142 So, when there is a lot of transactions inside the mempool and you also paid a relatively lower transaction payment, your transaction can stay unconfirmed for an prolonged timeframe given that miners/validators will select transactions with bigger fees initially. It is sort of sim... https://k12.instructure.com/eportfolios/1098588/entries/3707785