Block top - The block selection and duration of 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://bookmarkspecial.com/story20836529/helping-the-others-realize-the-advantages-of-blockchain-explorer-one-https-fletcher-odonnell-thoughtlanes-net-exploring-further-the-world-of-blockchain