Previously, the expressivity of our anonymous credential proving system was limited.
The holder could prove things like I have a credential(s), or certain attribute(s) across my credentials are the same or I can verifiably encrypt attribute(s) for traceability.
以前，我们的匿名凭证证明系统的表达能力是有限的。
持有人可以证明我有一个凭证，或者我的凭证中的某些属性是相同的，或者我可以可验证地加密属性以实现可追溯性。