Block top - The block variety and duration in the blockchain (in blocks) on creation of the current block Nonce - The transaction selection for the from address (bear in mind this begins at 0 so a nonce of 100 would truly be the one hundred and first transaction submitted https://dailyuploads.net/kv21pr0676da/Delving_into_the_Invisible_The_Importance_of_Blockchain_Explorers_in_the_Crypto_Worldznmrd.pdf