COGSmachine stack can turn any digital asset or NFT into a bound token  (BT) .
 
Then you can privately exchange assets like this shown in this video of selling  a CQDN, BT, and SSL Cert over private networks.  see:
https://twitter.com/COGSmachine/status/1656072890242957314?s=20

Thousands of years of history proof that Buying and selling is a private common law contract.   See Bill of Rights 7th Amendment and Article I Section X US Constitution (no state may impair the obligation of contract) .