Block top - The block number and length in the blockchain (in blocks) on development of the present 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 a hundred and first transaction submitted https://explorebookmarks.com/story20130891/everything-about-blockchain-explorer-https-md-darmstadt-ccc-de-znwtrv3frkwon6rj4y8pua