Block top - The block number and length from the blockchain (in blocks) on creation of the present block Nonce - The transaction range for your from address (bear in mind this begins at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://active-bookmarks.com/story20614584/the-greatest-guide-to-blockchain-explorer-unconfirmed-transaction-https-md-kif-rocks-qxb6ylbntwcjnvrpqnzeqw