Block top - The block variety and size with the blockchain (in blocks) on development of the present block Nonce - The transaction number for that from address (Remember this starts off at 0 so a nonce of a hundred would basically be the 101st transaction submitted by this account) https://socialislife.com/story5918948/what-does-blockchain-explorer-usdt-mean-https-independent-academia-edu-drewandreassen4