Block top - The block selection and length from the blockchain (in blocks) on creation 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://bookmarkindexing.com/story20126501/5-simple-statements-about-blockchain-explorer-solana-explained-https-files-fm-f-e6nkandt95