Privacy-Focused Layer-2 Networks Reframe Confidential Execution as an Institutional Requirement

Two privacy-oriented networks, Aztec and Miden, are recasting confidential transactions as a prerequisite for institutional use of public blockchains rather than a feature meant only for concealment. Both rely on zero-knowledge (ZK) proofs, which let a user demonstrate that a statement is true, such as eligibility or compliance with a rule, without disclosing the underlying data.

Miden describes a model of full privacy for the majority of users and conditional privacy for a small set of higher-risk activities, with compliance enforced at the application level rather than built into the protocol, according to its blog. Its stated aim is to keep network operators unable to see most transactions while still permitting selective disclosure when it is required.

Aztec has framed the central question as who controls the ability to turn privacy off. In its account, users alone should hold that control and decide who learns their data, in contrast to designs in which operators or designated auditors retain standing visibility, as it argues in one post. An Aztec transaction splits into a private half that runs on the user's own device and generates a proof, and a public half that executes transparently on the network's sequencers, the company explains.