Block top - The block number and size 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://cheapbookmarking.com/story20712093/the-greatest-guide-to-blockchain-explorer-unconfirmed-transaction-https-independent-academia-edu-drewandreassen4