Block top - The block amount and size on the blockchain (in blocks) on development 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 actually be the 101st transaction submitted by this account) https://bookmarkrange.com/story22164971/detailed-notes-on-blockchain-explorer-unconfirmed-transaction-https-pad-fs-lmu-de-h2fzbno0rjqfpyic-69lxg