Block top - The block number and length from the blockchain (in blocks) on creation of the present block Nonce - The transaction variety with the from address (Remember this starts at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) Contract generation https://bookmarkblast.com/story20407123/blockchain-explorer-search-an-overview-https-md-darmstadt-ccc-de-znwtrv3frkwon6rj4y8pua