Quicksilver Blockchain Explorer https://www.instapaper.com/p/16801185 A blockchain unconfirmed transaction refers into a transaction initiated by a user that is definitely but to generally be confirmed and recorded about the blockchain by a validator or miner. It is often known as a zero-affirmation transaction. These transactions remain in the mempool (memory pool) http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=3670142