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Privacy on Ethereum is being actively worked on by a number of different teams.

There are a couple of key technologies to know about:

  • Zero Knowledge-based
  • zk-SNARKs (used in Zcash)
  • zk-STARKs

Aztec Protocol is building an efficient zero-knowledge privacy protocol and decentralised exchange. The protocol is already live on Ethereum's mainnet.

Starkware Industries is using STARK technology to improve scalability and privacy on Ethereum.

Enigma Protocol are building 'secret contracts' which enable computation over encrypted data.