Zircuit Blockchain Explorer https://www.instapaper.com/p/16800704 So, if there is a large number of transactions in the mempool and you simply compensated a relatively minimal transaction cost, your transaction can keep on being unconfirmed for an prolonged length of time since miners/validators will select transactions with higher service fees to start with. https://leftbookmarks.com/story20782715/blockchain-explorer-analytics-and-web-services-the-basic-principles-of-blockchain-explorer-tron-https-cutt-ly-3rj9ygbc