Block top - The block selection and duration of the blockchain (in blocks) on generation of the present block Nonce - The transaction selection for the from address (bear in mind this starts at 0 so a nonce of 100 would truly be the a hundred and first transaction submitted https://letusbookmark.com/story22173779/blockchain-explorer-fundamentals-explained-https-www-webwiki-co-uk-cryptoexplorerhub-com