Block top - The block quantity and length in the blockchain (in blocks) on development 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 really be the 101st transaction submitted by this account) https://allkindsofsocial.com/story5579265/everything-about-blockchain-explorer-https-www-webwiki-fr-cryptoexplorerhub-com