NFTs don't even exist in the real world, but the market around them has a big effect on the planet.
National cryptocurrencies could make payments faster and prevent crime, but they come with their own risks.
Bitcoin's central appeal of anonymous, irreversible transactions could become its biggest weakness.
Where our money comes from is deeply political and the politics involved is often highly complex.
How tax authorities decide to treat virtual currencies like bitcoin may determine whether they thrive or die.