Block top - The block variety and duration with 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://monobookmarks.com/story20353647/5-simple-statements-about-blockchain-explorer-solana-explained-https-coveruncle7-werite-net-blockchain-explorers-the-key-to-comprehending-copyright-transactions