Block top - The block selection and duration of the blockchain (in blocks) on creation 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 basically be the 101st transaction submitted by this account) https://icelisting.com/story21532309/explorer-blockchain-base-an-overview-https-www-webwiki-co-uk-cryptoexplorerhub-com