Ether Blockchain Explorer https://files.fm/f/77bncktkx3 So, when there is a lot of transactions while in the mempool and you also paid a comparatively small transaction cost, your transaction can continue to be unconfirmed for an extended time frame since miners/validators will pick out transactions with better charges first. An unconfirmed transaction https://bookmarkforest.com/story20188444/blockchain-explorer-unconfirmed-transaction-not-known-factual-statements-about-explorer-blockchain-base-https-cutt-ly-3rj9ygbc