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://madesocials.com/story5727437/how-blockchain-explorer-xrp-can-save-you-time-stress-and-money-https-graph-org-unveiling-transparency-how-blockchain-explorers-function-09-04