How does an Issuer communicate a single-use (or similar) policy #260
Description
Issuers should signal to the wallet if he assumes/requests a privacy-preserving presentation of its credentials by the wallet. This topic came up during the wg call around #229.
As the main (or only) motivation for batch issuance was to enable such a policy, I had assumed that the presence of the batch issuance parameters in the issuer's metadata is that signal, as we don't have any other options today. We may define more fine-grained policies in the issuer metadata, but that train has passed for VCI 1.0.
Therefore, I propose (or actually @GarethCOliver during wg call) that we use the batch issuance parameters as a signal until we have better mechanisms in 1.0, and assume single use policy unless there is an out-of-band agreement between the issuer and the wallet