Block top - The block number and length from the blockchain (in blocks) on generation of the present block Nonce - The transaction selection with the from address (bear in mind this starts at 0 so a nonce of 100 would actually be the 101st transaction submitted by this account) https://socialbraintech.com/story5479509/a-review-of-blockchain-explorer-xrp-https-wikimapia-org-external-link-url-https-cryptoexplorerhub-com