Block top - The block number and length in the blockchain (in blocks) on development of the present block Nonce - The transaction range with the from address (Remember this starts at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) Contract generation https://socialwoot.com/story22110445/a-review-of-blockchain-explorer-xrp-https-escatter11-fullerton-edu-nfs-show-user-php-userid-9253086