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://bookmarksystem.com/story20236682/blockchain-explorer-fundamentals-explained-https-pad-fs-lmu-de-h2fzbno0rjqfpyic-69lxg