Block top - The block selection and duration with the blockchain (in blocks) on generation of the present block Nonce - The transaction number for the from address (bear in mind this starts at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://techonpage.com/story5892195/the-greatest-guide-to-blockchain-explorer-unconfirmed-transaction-https-500px-com-p-barrkijrooney