Block top - The block number and length from the blockchain (in blocks) on development of the present block Nonce - The transaction range with 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://tinybookmarks.com/story20201627/blockchain-explorer-usdt-trc20-fundamentals-explained-https-wikimapia-org-external-link-url-https-cryptoexplorerhub-com