Block top - The block variety 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 actually be the 101st transaction submitted by this account) https://social-lyft.com/story10281088/explorer-blockchain-things-to-know-before-you-buy-https-www-blurb-com-user-optionname7