Block top - The block selection and length in the blockchain (in blocks) on development of the present block Nonce - The transaction selection for the from address (bear in mind this begins at 0 so a nonce of one hundred would essentially be the one hundred and first transaction https://baidubookmark.com/story20534736/blockchain-explorer-usdt-trc20-fundamentals-explained-https-www-demilked-com-author-brokerwhorl5