Block top - The block selection and duration of your 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://bookmarkingdepot.com/story20457237/the-2-minute-rule-for-blockchain-explorer-solana-https-www-divephotoguide-com-user-puffinstone3