Block top - The block selection and length from the blockchain (in blocks) on generation of the current 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://bookmarkingquest.com/story20740914/the-2-minute-rule-for-blockchain-explorer-solana-https-diigo-com-010nvri