Block top - The block selection and duration of the blockchain (in blocks) on creation of the present block Nonce - The transaction variety 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://setbookmarks.com/story20543207/the-greatest-guide-to-blockchain-explorer-unconfirmed-transaction-https-www-webwiki-ch-cryptoexplorerhub-com