Block Explorer Mainnet http://pandora.nla.gov.au/external.html?link=https://cryptoexplorerhub.com So, when there is a large number of transactions inside the mempool therefore you compensated a relatively low transaction charge, your transaction can continue to be unconfirmed for an prolonged time period considering that miners/validators will find transactions with larger costs first... https://agendabookmarks.com/story20595458/explorer-blockchain-a-simple-key-for-blockchain-explorer-btc-unveiled-https-cutt-ly-3rj9ygbc