Block top - The block selection and length of the blockchain (in blocks) on creation of the current block Nonce - The transaction variety with 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://bookmarkquotes.com/story20637896/not-known-facts-about-blockchain-explorer-unconfirmed-transaction-https-www-folkd-com-submit-cryptoexplorerhub-com