Cardano (ADA)

Still a lot more testing, analysis and validation needed, but I think I have managed to get an early pseudo anonymous selective disclosure POC working on Cardano Preview. The current version allows a user to prove eligibility against a simple condition, such as holding at least 10 ADA at a snapshot (additionally I can possibly do other use-cases if this works like proof you delegate to a certain DRep at point in time X, additionally I believe it solves the issue of input / output tracing which undermines the privacy benefit, and a relay, fee payer or sponsorship wallet just felt nasty so I wasn't happy with that solution. It is still early and there are important privacy boundaries to solve. The current implementation still exposes some stake key related material to the verifier, so I would not call it fully private yet, I'm getting there though, based on what I've learnt I do believe it is possible and I have a design I've created. That said, I have a clear path in mind to move this towards stronger anonymous selective disclosure, where the verifier can confirm eligibility without seeing the underlying wallet identity. If this develops in the way I think it can, it could open up some very interesting use cases for Cardano based access control, including private website gating, Discord access, community verification and other credential flows. Very early days and until I have it fully functional I cannot confirm the possibility, but the POC is looking promising so far.

I know I'm blocked, but would love to know Charles, I can't tag unfortunately and others thoughts on this possible capability, I do feel this could open up a lot of use-cases, especially in fast moving compliance and regulation.