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://social-lyft.com/story10692473/the-2-minute-rule-for-blockchain-explorer-solana-https-rentry-co-4vomqtzo