How can you be sure that your registry has true data as supplied by the members.
I know crypto currency can be regulated by every country, though it is still far from reality, a regulations to be set will be super detailed. And yes one country must assign one institution to look after from creation of regulations to implementation.
the countries dont have to do it,
if the regulation institution simply uses agent to deal with the cryptocapitalists, and does regular random controlls and quality checks.