Block top - The block selection and size on the blockchain (in blocks) on creation of the current block Nonce - The transaction number for the from address (bear in mind this starts at 0 so a nonce of a hundred would essentially be the 101st transaction submitted by this https://dmozbookmark.com/story20705032/new-step-by-step-map-for-blockchain-explorer-unconfirmed-transaction-https-www-multichain-com-qa-user-knotdrop3