How the transactions contain the data of domain name and ip information in blockstack and namecoin in details ,use the op_return options or other methods?

For the BNS ,How the transactions contain the data of domain name and ip information(just like DNS) in blockstack and namecoin in details ,use the op_return options or other methods? thanks~

@summer We just use op_return to store the details. If you want to check the transaction details explorer.blockstack.org is a great place to explore the transaction formats.