Block top - The block variety and size with 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 actually be the 101st transaction submitted by this account) https://tvsocialnews.com/story5973172/5-simple-statements-about-blockchain-explorer-solana-explained-https-www-bitsdujour-com-profiles-iptrcw