Block top - The block number and length from the blockchain (in blocks) on creation of the present block Nonce - The transaction selection with 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://thejillist.com/story11194891/not-known-facts-about-blockchain-explorer-usdt-https-hedgedoc-digillab-uni-augsburg-de-mshxmk-praykwj94jou11g