Sam MacPherson, who works on protocol engineering for DAI issuer MakerDAO, tells Decrypt's Liam Kelly and Stacy Elliott in our Decrypting Mainnet series at Mainnet 2022 about how MakerDAO works, what's backing the decentralized stablecoin DAI, why it's safer than algorithmic stablecoins like TerraUSD, and his outlook for stablecoin regulation.