Block top - The block range and duration of your blockchain (in blocks) on generation of the present block Nonce - The transaction number for your from address (bear in mind this starts at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://bookmark-vip.com/story20375909/the-greatest-guide-to-blockchain-explorer-unconfirmed-transaction-https-atavi-com-share-xftxdaz1pgsb4