Government backed welfare currencies.
How these work the government generates new currency and backs up it value for welfare claimants people can also hold welfare currency as an investment currency with perks like tax breaks. many people more can get welfare support and such support can be used to subsidize things like health and public transport.
If you want to pay less tax you can open up a charitable project following good regulation and buy into the welfare currency to pay for your project.
When the welfare currency is exchanged for national reserve currency to spend. In the systematic's the tender effectively goes back to the government.
This makes the 3rd economy more enabled and allows the government to back more up and spend less overall.
This sort of thing would allow for more advanced saving options for common people also.
National gambling currencies.
This is a currency designed for investment an gambling. Every month the currency can create money at half that of inflation distributing the money to every punter but randomly distributed with some control.
Anonymous p2p gambling currencies.
These would have a backer currency and a redistributor system and work like one big p2p gambling mechanism.
Global trading currencies.
Global trade will do better with good global trading currencies who knows which ones will end up king.
Digital asset currencies.
One or two of these currency types should have a big grip on a large part of the market and it might lead to changes in intellectual property law. The issue could even flood into the fabrication market.
National reserve currencies.
These will be transformed into cryptographic tender and there will still be coins and notes issued but the currency flow will be more monitored.