Block top - The block selection and length from the blockchain (in blocks) on creation of the current block Nonce - The transaction variety for that 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://bookmarkinglife.com/story5857861/not-known-details-about-blockchain-explorer-usdt-trc20-https-www-instapaper-com-p-16864836