Block top - The block selection and duration of the blockchain (in blocks) on creation of the current block Nonce - The transaction variety for that from address (Remember this starts off at 0 so a nonce of a hundred would actually be the 101st transaction submitted by this account) https://infopagex.com/story5632656/the-smart-trick-of-explorer-blockchain-ethereum-that-nobody-is-discussing-https-hedgedoc-digillab-uni-augsburg-de-mshxmk-praykwj94jou11g