Block top - The block selection and length with the blockchain (in blocks) on development of the current block Nonce - The transaction range with the from address (Keep in mind this begins at 0 so a nonce of a hundred would actually be the one hundred and first transaction https://webcastlist.com/story22131867/blockchain-explorer-usdt-trc20-fundamentals-explained-https-500px-com-p-barrkijrooney