Block top - The block variety and length in the blockchain (in blocks) on development of the present block Nonce - The transaction selection 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://bookmarkspiral.com/story20822751/5-simple-statements-about-blockchain-explorer-solana-explained-https-www-bitsdujour-com-profiles-iptrcw