Check zero-knowledge proof based blockchains. They provide ways to build privacy-enhanced applications with smart contracts (called zkapps). I wrote about it a

Check zero-knowledge proof based blockchains. They provide ways to build privacy-enhanced applications with smart contracts (called zkapps). I wrote about it a bit here: https://www.cryptologie.net/article/575/whats-the-deal-with-zkapps/ https://www.cryptologie.net/article/575/whats-the-deal-with-...