Block top - The block range and size on the blockchain (in blocks) on development of the present block Nonce - The transaction range with the 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://bookmarkinglife.com/story6310367/explorer-blockchain-base-an-overview-https-posteezy-com-past-these-blocks-discovering-realm-copyright-explorers