Block top - The block selection and duration of the blockchain (in blocks) on creation of the current block Nonce - The transaction amount for the from address (bear in mind this starts off at 0 so a nonce of 100 would actually be the 101st transaction submitted by this https://bookmarkspecial.com/story20628167/5-simple-statements-about-blockchain-explorer-solana-explained-https-www-blurb-com-user-optionname7