Block top - The block number and length of your blockchain (in blocks) on generation of the present block Nonce - The transaction number 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://bookmarksparkle.com/story20707117/the-ultimate-guide-to-eth-blockchain-explorer-https-graph-org-unveiling-transparency-how-blockchain-explorers-function-09-04