Block top - The block number and length of the blockchain (in blocks) on creation of the current block Nonce - The transaction range with the from address (Remember this starts off at 0 so a nonce of a hundred would actually be the 101st transaction submitted by this account) https://bookmarknap.com/story10753794/a-review-of-blockchain-explorer-xrp-https-rentry-co-4vomqtzo