Block top - The block number and length in the blockchain (in blocks) on development of the current block Nonce - The transaction variety for that from address (Remember this starts off at 0 so a nonce of a hundred would actually be the 101st transaction submitted by this account) https://getsocialsource.com/story6037509/top-guidelines-of-explorer-blockchain-solana-https-numberfields-asu-edu-numberfields-show-user-php-userid-6240092