Block Explorer Transaction Id https://www.instapaper.com/p/16800964 So, when there is a lot of transactions while in the mempool so you paid out a comparatively low transaction rate, your transaction can continue to be unconfirmed for an extended time period considering the fact that miners/validators will pick out transactions with larger fees https://tealbookmarks.com/story20784702/blockchain-explorer-analytics-and-web-services-not-known-facts-about-blockchain-explorer-address-https-cutt-ly-3rj9ygbc