Block top - The block amount and size on the blockchain (in blocks) on development of the present block Nonce - The transaction selection with 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://kingslists.com/story21834721/5-simple-statements-about-blockchain-explorer-solana-explained-https-clancy-olesen-4-mdwrite-net-opening-the-record-your-resource-to-blockchain-investigation