Block top - The block quantity and size in the blockchain (in blocks) on generation of the current block Nonce - The transaction quantity for your from address (Remember this starts off at 0 so a nonce of a hundred would really be the 101st transaction submitted by this account) https://one-bookmark.com/story20152916/5-simple-statements-about-blockchain-explorer-solana-explained-https-vuf-minagricultura-gov-co-lists-informacin-20servicios-20web-dispform-aspx-id-11784754