Block top - The block selection and length of the blockchain (in blocks) on creation of the current block Nonce - The transaction variety for that from address (Remember this starts off at 0 so a nonce of a hundred would actually be the 101st transaction submitted by this account) https://socialbaskets.com/story6040588/detailed-notes-on-blockchain-explorer-unconfirmed-transaction-https-md-darmstadt-ccc-de-znwtrv3frkwon6rj4y8pua