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://bookmarklinking.com/story8961573/top-guidelines-of-explorer-blockchain-solana-https-numberfields-asu-edu-numberfields-show-user-php-userid-6240092