Block top - The block selection and duration of the blockchain (in blocks) on creation of the current block Nonce - The transaction variety with the 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://livebookmarking.com/story20196506/blockchain-explorer-usdt-trc20-fundamentals-explained-https-list-ly-churchkjeldsen86wpibju