Block height - The block quantity and size on the blockchain (in blocks) on generation of the present block Nonce - The transaction selection for the from address (bear in mind this begins at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://apollobookmarks.com/story20349482/detailed-notes-on-blockchain-explorer-unconfirmed-transaction-https-cuwip-ucsd-edu-members-georgeuncle0-activity-1839979