Electroneum Blockchain Explorer https://output.jsbin.com/nisuteliyi/ So, if there is a large number of transactions from the mempool so you paid a relatively small transaction cost, your transaction can continue to be unconfirmed for an extended period of time considering the fact that miners/validators will decide on transactions with larger fees initially. https://reallivesocial.com/story6089751/blockchain-explorer-confirmed-transactions-the-ultimate-guide-to-blockchain-explorer-one-https-cutt-ly-3rj9ygbc