TrustBloc

TrustBloc is an interoperability initiative that provides infrastructure for consortium-based digital identity and document provenance. Built on W3C standards for Verifiable Credentials and Decentralized Identifiers (DIDs), it implements the Sidetree protocol over permissioned ledgers to enable groups of independent entities to share custody of DID registries. The platform supports emerging interoperable standards including DID, Revocation2020, EDV/SDS, KMS, CBOR, and the W3C global interoperability suite.

The core technical architecture combines Hyperledger Fabric for the ledger layer with enhanced private collections to support Sidetree operations without requiring individual transactions for each identifier. Notable features include an off-chain distributed storage model, organization-scoped data storage and querying, and a verifiable credential exchange flow based on DIDs and hubs. The platform has been implemented by major organizations including the Government of Canada and the Department of Homeland Security for use cases like portable secure digital credentials and alternatives to Social Security Numbers.

TrustBloc aims to reduce trust obstacles while allowing consortiums to differentiate their service offerings. Key capabilities include:

• Support for multiple credential sources in single transactions
• Real-time and stored claims functionality
• Integration with open/standard APIs and data models
• Privacy-preserving data sharing through selective disclosure
• Interoperability with other W3C-compliant verifiable credential networks

The project has notable implementations with the Government of Canada for portable secure digital credentials and the DHS for developing SSN alternatives.