Block top - The block selection and duration of the blockchain (in blocks) on creation of the current block Nonce - The transaction quantity for your from address (Keep in mind this begins at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://listfav.com/story22223165/5-simple-statements-about-blockchain-explorer-solana-explained-https-www-multichain-com-qa-user-knotdrop3