Block top - The block range 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 truly be the a hundred and first transaction submitted https://infopagex.com/story5658459/blockchain-explorer-fundamentals-explained-https-mathiasen-curry-2-federatedjournals-com-diving-deep-blockchain-explorers