Block top - The block range and duration of your blockchain (in blocks) on creation of the current block Nonce - The transaction quantity for your from address (bear in mind this begins at 0 so a nonce of 100 would truly be the 101st transaction submitted by this account) https://tornadosocial.com/story5965287/5-simple-statements-about-blockchain-explorer-solana-explained-https-www-blurb-com-user-optionname7