Block top - The block amount and length of the blockchain (in blocks) on creation of the current block Nonce - The transaction range for the from address (bear in mind this starts at 0 so a nonce of one hundred would actually be the a hundred and first transaction https://baidubookmark.com/story20534168/the-definitive-guide-to-explorer-blockchain-ethereum-https-mathiasen-curry-2-federatedjournals-com-diving-deep-blockchain-explorers