Block top - The block quantity and length in the blockchain (in blocks) on development of the present block Nonce - The transaction range with the from address (bear in mind this starts at 0 so a nonce of 100 would actually be the 101st transaction submitted by this account) https://bookmarkindexing.com/story20150020/not-known-details-about-blockchain-explorer-usdt-trc20-https-urlscan-io-result-0199164a-7dbe-7737-944c-199699cc315c