Polkadot Blockchain Explorer https://myspace.com/neergaard26liu So, if there is a large number of transactions from the mempool and you paid a relatively very low transaction cost, your transaction can remain unconfirmed for an prolonged length of time considering the fact that miners/validators will decide on transactions with increased charges first. It http://pandora.nla.gov.au/external.html?link=https://cryptoexplorerhub.com