Block top - The block selection and duration of the blockchain (in blocks) on creation of the current block Nonce - The transaction amount to the from address (Keep in mind this starts at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://7bookmarks.com/story20444415/blockchain-explorer-usdt-trc20-fundamentals-explained-https-intensedebate-com-people-hawkwhorl3