Block top - The block number and length from the blockchain (in blocks) on creation of the current block Nonce - The transaction quantity 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://ledbookmark.com/story6063415/blockchain-explorer-usdt-trc20-fundamentals-explained-https-gaiaathome-eu-gaiaathome-show-user-php-userid-1577569