Block top - The block selection and duration of the blockchain (in blocks) on creation of the present block Nonce - The transaction selection with the from address (Remember this starts off at 0 so a nonce of a hundred would actually be the 101st transaction submitted by this account) https://7bookmarks.com/story20132190/5-simple-statements-about-blockchain-explorer-solana-explained-https-squareblogs-net-heartgarlic3-delving-into-blockchain-explorers