Ether Blockchain Explorer https://www.demilked.com/author/crawford18sheehan/ So, when there is a lot of transactions while in the mempool so you paid out a comparatively very low transaction cost, your transaction can continue being unconfirmed for an extended length of time considering the fact that miners/validators will pick out transactions with better costs https://agendabookmarks.com/story20273926/blockchain-explorer-btc-the-best-side-of-blockchain-explorer-search-https-cutt-ly-3rj9ygbc