Block top - The block amount and size on the blockchain (in blocks) on generation of the present block Nonce - The transaction selection 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://bookmarkity.com/story20437073/helping-the-others-realize-the-advantages-of-blockchain-explorer-one-https-clancy-olesen-4-mdwrite-net-opening-the-record-your-resource-to-blockchain-investigation