Why a new model? · Tamga Network

Today’s model: “hand over a copy of the document”

What do you do when you need to prove something? You hand over a photocopy of your ID card, upload a scan of your diploma, email a PDF of your statement. In other words, as proof you deliver a copy of the document.

That copy is then stored on the other party’s server. This model has three fundamental problems:

Data piles up everywhere. Every institution keeps a copy of your data. Scattered across hundreds of places, these copies form a huge surface for privacy breaches and leaks.
Everyone repeats the same work. The bank, the hospital and the university all re-verify the same identity. With no shared trust layer, everyone reinvents the wheel.
Authenticity is left to the “copy”. It’s hard to tell whether a PDF is real or fake. You can’t spot a Photoshopped document with the naked eye.

A concrete example

You need to prove your age to enter a bar. You show your ID — but alongside your age it also has your name, address, national ID number and place of birth. You only meant to say “I’m over 18,” yet you’re actually showing everything about yourself.

The new model: portable, verifiable proof

The new model reverses this logic:

Data stays with you. Your documents live on your device, under your control; not on institutions’ servers.
Only the necessary proof is shared. You can present proof that you’re “over 18” without ever giving your birth date.
Verification happens without going to the source. The document carries the cryptographic signature of the institution that issued it. The verifier checks mathematically that the signature is genuine — without asking the institution at all.

These three principles — user control, data minimization and cryptographic verification — are the foundation of modern digital identity. The European Union made this mandatory at continental scale with eIDAS 2.0.

Next step

To understand this model, let’s first clarify the concept of “digital identity.”