Block top - The block selection and duration from the blockchain (in blocks) on creation 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 really be the 101st transaction submitted by this account) https://letsbookmarkit.com/story20635530/the-smart-trick-of-explorer-blockchain-ethereum-that-nobody-is-discussing-https-canvas-instructure-com-eportfolios-4028322-entries-14252553