The more I think about Sign, the more I suspect the real tension is not technical credibility, governance design, or even institutional adoption on its own.
It is whether a single verification framework can survive contact with how messy qualification actually is in the real world.
On paper, systems like this make perfect sense. You create shared credential logic, make verification portable, automate decisions, reduce duplication, and lower costs. That is the clean version. The problem is that rights, access, and eligibility are rarely clean. They are shaped by local law, institutional discretion, political compromise, and human exceptions that do not fit neatly into standardized logic.
That is what keeps bothering me.
The more universal the infrastructure tries to become, the more it runs into the fact that trust is often contextual. A ministry, university, bank, or online network may all need verification, but they do not define legitimacy the same way. What counts as valid in one setting may be incomplete or unacceptable in another.
So the challenge for Sign may not be proving the system works.
It may be proving that standardization does not flatten important differences.
Because if the infrastructure becomes too rigid, institutions will resist it. And if it becomes too flexible, the promise of a common standard starts to weaken. That balance is where the real difficulty lives.