Block top - The block quantity and size on 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://webcastlist.com/story21754852/the-2-minute-rule-for-blockchain-explorer-solana-https-files-fm-f-e6nkandt95