Block top - The block number and size with the blockchain (in blocks) on generation of the present block Nonce - The transaction number for the 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://getsocialsource.com/story6020160/how-blockchain-explorer-xrp-can-save-you-time-stress-and-money-https-diigo-com-010nvri