unregistered bitcoin-denominated securities exchange, though a cryptobond denominated in your own coin sounds just like a SAFT, so not really new.
If registered, whats your FCS number? What is the name of the officer in charge of your MiFid compliance? How are you preventing US citizens from joining?
Please have a look at the relevant legal framework in the links stated above, so that we talk on the same terms / jurisdiction and discuss relevant questions.