Block top - The block variety and size with the blockchain (in blocks) on generation of the present block Nonce - The transaction selection with the from address (Remember this starts at 0 so a nonce of 100 would actually be the 101st transaction submitted by this account) Not just https://dmozbookmark.com/story20359240/what-does-blockchain-explorer-usdt-mean-https-wikimapia-org-external-link-url-https-cryptoexplorerhub-com