Block top - The block amount and size on the blockchain (in blocks) on generation of the present block Nonce - The transaction selection 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://bookmarkgenius.com/story20140590/5-tips-about-blockchain-explorer-you-can-use-today-https-www-folkd-com-submit-cryptoexplorerhub-com