Why Is Blockchain Explorer Not Working Today https://bbs.pku.edu.cn/v2/jump-to.php?url=https://cryptoexplorerhub.com So, when there is a lot of transactions within the mempool and you paid a relatively very low transaction cost, your transaction can continue to be unconfirmed for an extended time period since miners/validators will pick out transactions with increased charges first. https://output.jsbin.com/nisuteliyi/