The spec draft can be found here
Zk assets aka zcash shielded assets (previously UDAs). bring private stable coins, wrapped Bitcoin and Eth, and other tokens to Zcash with the same privacy as shielded transactions, Indeed, no one can tell the difference between a shielded zec transaction and a zk-asset transaction.
As a follow up on the successful user defined assets panel at Zcon2 and requests that I do more than research and suggest ideas, I wrote up a quick draft spec for zk-assets. Various people have contributed to the draft and much of the work and ideas are due to others. In particular, I’d like to thank Str4d and Daira for the circuit techniques showing this was feasible and Nuttycom for some of the economic ideas.
V0 of the spec is the core technical protocol. V1 considers possible economic mechanisms and discusses how much they are needed and what the trade offs are.
As ECC, ZFND, and the zcash community as a whole start looking at what to develop after Halo2/Orchard, its good to have concrete options. The question is which do we prioritize.
[Edit, as a clarification. The engineers at ECC and ZFND have been working their ass off. So I’d imagine there’s going to be some much deserved down time after Halo2/Orchard. The question is, once thats done and everyone moves on to whats next, well whats next for core protocol changes? This isn’t a demand to hurry up and do something now, its a request as a community we explicitly decide what we are doing next rather than just going forward on the existing momentum]