i know how to do this and i can explain it to you:
1. you need to create a registry where all cryptocurrency owners are being registered with their adress they must respons, not just through it systems but also physically
2. you force them to show and open their data
3. you write and publish the regulation form, description and goals.
4. you create a global strike force or so called economic hitman to execute sanctions if a cryptocapitalists fails to achieve that regulation
5. you will have create an insitution that regulates cryptocurrencies.
-> all cryptocurrencies that follow that regulation are regulated, and under enforcment of that insitution.
regards
you see its actually possible to create a regulation if you can create an institution which is the equivalent of standards and poor. but for crypto and you get a global hitman in work.
for that you need good contacts either to interpol or to a global mercenary group. like blackwater. or those secretive agents/economic hitmans
Actually there are wallets that's are already regulated by the government. It may not be all countries have it but some already implemented it and it goes well with the users of the wallet. Though they will be having limited deposits on it, but it does not limit the inputs coming from the blockchain or from the external exchanges.