Block top - The block selection and duration of the blockchain (in blocks) on creation of the current block Nonce - The transaction quantity for your from address (Remember this starts off at 0 so a nonce of a hundred would actually be the 101st transaction submitted by this account) https://bookmarks-hit.com/story23437021/blockchain-explorer-usdt-trc20-fundamentals-explained-https-files-fm-f-e6nkandt95