Block top - The block range and duration of your blockchain (in blocks) on generation of the present block Nonce - The transaction number for your 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://socialinplace.com/story5906051/5-simple-statements-about-blockchain-explorer-solana-explained-https-lamm-tolstrup-3-blogbright-net-investigating-the-unseen-the-role-of-blockchain-explorers-in-the-copyright-world