Block top - The block number and length in the blockchain (in blocks) on development of the current block Nonce - The transaction selection 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://yourbookmarklist.com/story20769198/blockchain-explorer-fundamentals-explained-https-squareblogs-net-heartgarlic3-delving-into-blockchain-explorers