Block top - The block number and length of the blockchain (in blocks) on generation of the present block Nonce - The transaction number 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://trackbookmark.com/story22255668/5-simple-statements-about-blockchain-explorer-solana-explained-https-vuf-minagricultura-gov-co-lists-informacin-20servicios-20web-dispform-aspx-id-11784754