Block top - The block number and length from the blockchain (in blocks) on creation of the current block Nonce - The transaction quantity 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://bookmarkmargin.com/story20290267/the-greatest-guide-to-blockchain-explorer-unconfirmed-transaction-https-notes-io-ww2s8