Block height - The block amount 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 starts at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://wise-social.com/story6362252/the-greatest-guide-to-blockchain-explorer-unconfirmed-transaction-https-diigo-com-010nvri