Block top - The block number and length in the blockchain (in blocks) on development of the present block Nonce - The transaction range with 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://sites2000.com/story10481471/5-simple-statements-about-blockchain-explorer-solana-explained-https-squareblogs-net-heartgarlic3-delving-into-blockchain-explorers