Blockchain Explorer Bitcoin Scan https://www.instapaper.com/p/16800964 So, if there is a large number of transactions during the mempool and also you paid a relatively very low transaction price, your transaction can stay unconfirmed for an prolonged length of time due to the fact miners/validators will pick transactions with greater fees initially. https://onelifesocial.com/story6031555/blockchain-explorer-unconfirmed-transaction-not-known-facts-about-blockchain-explorer-address-https-cutt-ly-3rj9ygbc