Confidential asset tracing

The issuer of an asset may place a tracing policy on the asset to ensure that every future transaction involving this asset will be visible to the issuer while remaining confidential to the public. For example, a company issuing stock could place a tracing policy on the stock asset so that it can track the identities of its shareholders even as the stock passes hands through confidential secondary trades. The exact information visibility is configurable, as is the list of viewers (the viewer may be a regulator or arbitrator instead of the issuer). Users can see what policies are attached to an asset and avoid using it if they are uncomfortable with the policies.