Digidentitywise, GDS are breaking their own rules
What were previously known in the science fiction/fantasy world of GDS as "identity providers" are now known as "certified companies".
All certified companies are certified by tScheme.
That's the rule.
Without that, they're not certified.
tScheme maintains a list of approved services, http://www.tscheme.org/directory/appserv.html
Digidentity are not on the list.
tScheme also maintains a list of registered applicants, http://www.tscheme.org/directory/appserv.html
That's the list with Digidentity on it.
They've applied for tScheme's seal of trust but they haven't been granted it yet.