Block top - The block selection and duration on the blockchain (in blocks) on generation of the present block Nonce - The transaction selection for the from address (bear in mind this starts at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://agency-social.com/story5376620/not-known-details-about-blockchain-explorer-usdt-trc20-https-fletcher-odonnell-thoughtlanes-net-exploring-further-the-world-of-blockchain