Block top - The block number and length from the blockchain (in blocks) on development of the current block Nonce - The transaction range with the from address (Remember this starts off at 0 so a nonce of a hundred would actually be the 101st transaction submitted by this account) https://bookmarkwuzz.com/story20667449/blockchain-explorer-usdt-trc20-fundamentals-explained-https-www-instapaper-com-p-16864836