Block top - The block selection and duration of the blockchain (in blocks) on creation of the present block Nonce - The transaction selection for the from address (bear in mind this starts at 0 so a nonce of 100 would actually be the 101st transaction submitted by this account) https://lamm-tolstrup-3.blogbright.net/investigating-the-unseen-the-role-of-blockchain-explorers-in-the-copyright-world