[
  {
    "sub": "https://issuerregistry.sandbox.credentialengine.org/oidfed"
  },
  {
    "sub": "https://oidf.staging.findy.fi"
  },
  {
    "sub": "https://pro.heidiverse.com/api/federation/test"
  },
  {
    "sub": "https://registry.dcconsortium.org/"
  },
  {
    "sub": "https://test.registry.dcconsortium.org/"
  },
  {
    "sub": "https://staging.opensalt.net/issuer-registry"
  }
]