Block top - The block selection and length of the blockchain (in blocks) on creation of the current block Nonce - The transaction amount to 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://health-lists.com/story21256736/blockchain-explorer-usdt-trc20-fundamentals-explained-https-pad-fs-lmu-de-h2fzbno0rjqfpyic-69lxg