Nem 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 very low transaction payment, your transaction can stay unconfirmed for an prolonged timeframe due to the fact miners/validators will select transactions with better costs initial. An unconfirmed transaction is https://free-bookmarking.com/story20563157/explorer-blockchain-btc-explorer-blockchain-tron-options-https-cutt-ly-3rj9ygbc