What DPI Actually Is
Digital Public Infrastructure (DPI) is a framework for building shared digital systems that serve an entire population — the way roads, electricity grids, and water systems serve as physical public infrastructure.
The concept emerged from India’s experience building Aadhaar (biometric identity), UPI (payments), and DigiLocker (document verification) as interoperable public infrastructure layers. These systems now serve over a billion people and process billions of transactions monthly.
DPI is not a product. It’s not a platform. It’s a design philosophy: build shared, interoperable digital systems as public goods, then let the private sector build services on top.
The Three DPI Layers
The DPI framework, as articulated by organizations like the Centre for Digital Public Infrastructure and the UNDP, identifies three foundational layers:
Identity. A system that allows individuals to prove who they are — digitally, verifiably, and under their own control. This is the foundational layer. Without digital identity, the other layers cannot function.
Payments. A system that allows value to be transferred between individuals, businesses, and governments — instantly, interoperably, and at near-zero cost.
Data exchange. A system that allows data to be shared between organizations with the individual’s consent — securely, verifiably, and with clear governance.
Why Identity Is the Foundation
Every government digital service — from social benefit distribution to business licensing to healthcare access — requires knowing who the citizen is. In the physical world, this is handled by paper documents: national ID cards, birth certificates, driver’s licenses.
In the digital world, these paper documents don’t translate. Scanning a paper ID and uploading a JPEG is not digital identity — it’s digitized paper. True digital identity requires:
- Cryptographic verification. The identity credential is digitally signed by the issuing authority and can be verified without contacting that authority.
- Selective disclosure. The citizen can prove specific attributes (age, nationality, eligibility) without revealing unnecessary information (address, full date of birth).
- Offline capability. The identity can be verified even when internet connectivity is unavailable — critical for rural areas and developing regions.
- Citizen control. The citizen holds their credential and decides when and with whom to share it. The government issues; the citizen controls.
The Standards Landscape
Three major credential formats are competing for adoption in government digital identity:
ISO 18013-5 (mDoc) — the standard for mobile driver’s licenses, optimized for in-person NFC verification. Used by US states and EUDI member states.
W3C Verifiable Credentials — a flexible, JSON-based credential format that can represent any type of credential. Broad applicability but more implementation complexity.
SD-JWT VC — a compact, web-friendly format with built-in selective disclosure, gaining traction in the European EUDI ecosystem.
A well-designed DPI identity layer should be format-agnostic, supporting all three standards and letting the credential type determine the format.
What This Means for Governments
Governments building digital identity infrastructure face a choice: build proprietary systems that lock citizens into a single vendor, or build on open standards that create an interoperable ecosystem.
The DPI approach favors the latter. Open standards, open APIs, and interoperable systems — where the government controls the policy and governance layer, and the market delivers services through a competitive ecosystem.
The KeyShare Digital ID Platform is built on this philosophy: DPI-native architecture, all three credential standards supported, sovereign deployment available, and designed for countries building citizen-centric digital identity infrastructure.
