I been sitting with issuer design for a bit and something about “same credential, different issuers” keeps bothering me 😂
I see on paper, identity systems like @SignOfficial treat credentials as structured truth. an issuer defines a schema, signs it, and anyone with the right keys can verify it. clean, consistent, machine-readable. if two credentials follow the same format, they should mean the same thing.
but that assumption only holds if issuers interpret things the same way.
Let's take something simple like a “professional certification.” one issuer might require formal exams, supervised hours, and periodic renewal. another might issue it after a short course or internal assessment. both credentials can look identical at the schema level. same fields. same structure. same cryptographic validity.
but I now don’t represent the same standard.
and the system won’t catch that. from a verification standpoint, both are valid. both are signed. both pass the check. the difference lives outside the cryptography, in the policy decisions each issuer makes before the credential ever exists.
that’s where things start to change a bit.
verifiers now have to decide which issuers they trust and to what extent. not just “is this credential valid?” but “what does this actually mean coming from this issuer?” that introduces a second layer of interpretation on top of verification.
it gets more complex when these credentials move across borders or systems.
an employer, a government agency, or a platform might receive two credentials that look interchangeable but aren’t. unless there’s a shared standard or a reputation layer for issuers, the system pushes that burden onto the verifier. and at scale, that’s not a small problem.
because now consistency depends less on the infrastructure and more on coordination between issuers.
$SIGN can make credentials portable, verifiable, and easy to distribute. but portability doesn’t guarantee equivalence. it just guarantees that something can be checked not that it carries the same weight everywhere it goes.
so the question becomes whether identity systems can stay coherent when multiple issuers define the “same” credential differently… or if verification stays technically correct while meaning slowly fragments across the network 🤔