Block top - The block selection and duration of the blockchain (in blocks) on creation of the current 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://admiralbookmarks.com/story20849136/blockchain-explorer-usdt-trc20-fundamentals-explained-https-escatter11-fullerton-edu-nfs-show-user-php-userid-9253086