Block top - The block number and size from 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://sociallytraffic.com/story5308408/new-step-by-step-map-for-blockchain-explorer-unconfirmed-transaction-https-skitterphoto-com-photographers-1387379-jimenez-deleuran