Block top - The block selection and duration of the blockchain (in blocks) on creation of the current block Nonce - The transaction amount 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://bookmarkcolumn.com/story20512341/the-smart-trick-of-explorer-blockchain-ethereum-that-nobody-is-discussing-https-www-blurb-com-user-optionname7