W3C · NIST · GS1 · FDA

Decentralized identity, open standards

LedgerDomain's platform delivers secure, authenticated data to the U.S. pharmaceutical supply chain. Built on open standards, our stack features identity-driven master data management, privacy-first file and message sharing, and clean integrations with mature systems.

Explore did:webplus →Read the spec
W3Cstandards-based decentralized identifiers & verifiable credentials
did:web+a fit-for-purpose DID method for regulated supply chains
MITopen source and free for the community to build on
The platform

Identity you can verify — for years, not seconds

Every credential, message, and file we handle is anchored to decentralized identifiers your partners can verify independently, without depending on any single provider. That makes trust portable across the supply chain and durable over time. The LedgerDomain identity platform was built in close collaboration with stakeholders in every sector, including a public-private partnership with the industry and FDA.
How LedgerDomain's decentralized identity platform is expressed in software

Decentralized identifiers

Portable, cryptographically verifiable identifiers (DIDs) that don't rely on a central directory. Partners resolve and trust them on their own terms.

Verifiable credentials

Tamper-evident credentials — ATP status, licensure, product data — that any counterparty can check instantly, offline, and after the fact.

Secure applications

Privacy-first file and message sharing, a scalable deployment architecture, and lightweight clients — the secure plumbing behind every workflow.
The Foundation

Interoperability begins with open standards

Interoperability isn't a feature we bolt on; it's the foundation. We work closely with the industry to develop and build trusted standards.

W3C compliance

Credentials and presentations that conform to the W3C data model, verifiable by anyone.

OCI compliance

Aligned with the Open Credentialing Initiative for ATP credentialing across the pharma supply chain.

PDG compliance

Built to the Partnership for DSCSA Governance interoperability blueprint for lawful, electronic data exchange.
Open source initiative

Introducing a fit-for-purpose DID method

The W3C did:web method is simple and easy to implement — but many implementations treat verifiable presentations as ephemeral, checked only at the moment they're received. Highly regulated industries like the U.S. pharmaceutical supply chain need to confirm a presentation's historical validity for years after it was created.

did:webplus is a balanced, fit-for-purpose extension of did:web that delivers stronger guarantees with a moderate implementation lift.

  • Immutability and auditability for every credential
  • Seamless key rotation with a complete key-usage history
  • Stronger guarantees — without the weight of a full blockchain
  • Built for regulated ecosystems, and released for any similarly situated community
Read the spec →Join the project on GitHub
Proposed and developed in the open at the DIF DID Methods Workgroup.
Reference implementation

The did:webplus stack

Open-source components you can run today as Docker images on GHCR. A DID's history lives in a verifiable microledger; these services create, host, resolve, and verify it.

CLI

did-webplus-cli

Client-side operations — DID resolution, creation, and key updates — from the command line.

Readme →
VDR

Verifiable Data Registry

Reference service that hosts a DID's microledger so its full update history stays available and auditable.

Readme →
VDG

Verifiable Data Gateway

Reference service for fetching and verifying DID data across registries on behalf of relying parties.

Readme →
URD

Universal Resolver Driver

Plugs did:webplus into the DIF Universal Resolver so any ecosystem can resolve it with familiar tooling.

Readme →
Docker imagesghcr.io/ledgerdomain/did-webplus-clidid-webplus-vdrdid-webplus-vdgdid-webplus-urd
Get started

Build on decentralized identity

Talk to us about credentials, tracing, and verifiable data for your supply chain — or dive straight into the open-source project.

Get in touch →Join did:webplus on GitHub
Heritage & community

From blockchain pilots to fit-for-purpose identity

Our work began with landmark blockchain pilots. In 2019, the FDA selected LedgerDomain and UCLA Health for its DSCSA Pilot Project Program, and our BRUINchain system tracked real medications to the refrigerator level inside UCLA Health’s specialty pharmacy. That work, and the credentialing study that followed with supply-chain leaders at Genentech, Amgen, and Sanofi, is peer-reviewed in Blockchain in Healthcare Today and collected in our publications library.

Those pilots taught us where heavyweight distributed ledgers genuinely help and where they get in the way. They led us directly to lighter-weight, standards-based decentralized identity like did:webplus. The principles we took away are set out in Ten Axioms for Digital Identity.

LedgerDomain is a member of:

  • Healthcare Distribution Alliance (HDA)
  • HIMSS
  • GS1 US Healthcare
  • Partnership for DSCSA Governance (PDG)
  • Open Credentialing Initiative (OCI)
  • Clinical Supply Blockchain Working Group (CSBWG)