Block top - The block number and length in the blockchain (in blocks) on development of the current block Nonce - The transaction quantity for the from address (Keep in mind this starts at 0 so a nonce of 100 would essentially be the 101st transaction submitted by this account) https://whitebookmarks.com/story20474320/a-review-of-blockchain-explorer-xrp-https-notes-io-ww2s8