Block top - The block variety and duration from the blockchain (in blocks) on development of the current block Nonce - The transaction number with the from address (Keep in mind this commences at 0 so a nonce of 100 would essentially be the 101st transaction submitted by this account) https://hyperbookmarks.com/story20400854/blockchain-explorer-usdt-trc20-fundamentals-explained-https-pad-fs-lmu-de-h2fzbno0rjqfpyic-69lxg