Block top - The block number and length from the blockchain (in blocks) on development of the current block Nonce - The transaction number for your from address (bear in mind this begins at 0 so a nonce of 100 would really be the 101st transaction submitted by this account) https://letsbookmarkit.com/story20680155/the-greatest-guide-to-blockchain-explorer-unconfirmed-transaction-https-hedgedoc-digillab-uni-augsburg-de-mshxmk-praykwj94jou11g