Block top - The block number and duration with the blockchain (in blocks) on generation of the present block Nonce - The transaction number 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://socialmarkz.com/story11380310/blockchain-explorer-usdt-trc20-fundamentals-explained-https-www-bitsdujour-com-profiles-iptrcw