Block top - The block number and length from the blockchain (in blocks) on development of the current 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://free-bookmarking.com/story20559937/5-tips-about-blockchain-explorer-you-can-use-today-https-mathiasen-curry-2-federatedjournals-com-diving-deep-blockchain-explorers