Bitcoin Explorer Download https://output.jsbin.com/nisuteliyi/ So, when there is numerous transactions while in the mempool therefore you paid out a relatively reduced transaction cost, your transaction can stay unconfirmed for an extended timeframe since miners/validators will choose transactions with bigger expenses very first. These transactions remain in the mempool (memory pool) https://natural-bookmark.com/story20189455/blockchain-explorer-tool-tron-blockchain-explorer-for-dummies-https-cutt-ly-3rj9ygbc