Block top - The block number and length in the blockchain (in blocks) on development of the present block Nonce - The transaction range 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://bookmarklinking.com/story8057091/detailed-notes-on-blockchain-explorer-unconfirmed-transaction-https-notes-io-ww2s8