Top 5 Self‑Sovereign Identity Protocols for Decentralized Onboarding

1. OpenID for Verifiable Credentials (OpenID4VC)

OpenID4VC links identity credentials to OAuth‑based authorization flows, easing integration with existing web and mobile systems. The OpenID4VCI specification defines a protected OAuth API for issuing credentials, while OpenID4VP specifies how verifiers request and receive credential presentations. Built on OAuth 2.0, it supports W3C Verifiable Credentials, mdoc ISO, SD‑JWT VC, and AnonCreds. For crypto exchanges and banks, OpenID4VP simplifies wallet‑based verification, aligning with familiar authentication patterns.

2. cheqd

Launched on 23 November 2021, cheqd is a London‑based network that fuses credential issuance with payment systems and trust registries. It runs on the Cosmos ecosystem and uses delegated proof‑of‑stake consensus. The platform manages DID lifecycles, associated resources, trust registries, and status lists such as StatusList2021 and BitstringStatusList. cheqd supports credential standards and exchange methods including W3C VCDM, SD‑JWT, OpenID4VC, AnonCreds, and DIDComm. Its unique „Credential Payments” feature lets verifiers pay issuers to unlock credential status, creating an optional „verifier‑pays‑issuer” model rather than a mandatory fee per check. cheqd is ideal for organizations needing full credential management beyond initial issuance, offering robust APIs without building identity components from scratch.

3. Hyperledger Indy

Hyperledger Indy is an open‑source framework for distributed ledgers, designed specifically for decentralized identity. It supplies the infrastructure for DIDs, verifiable credentials, and privacy‑preserving credential exchange. Indy provides a decentralized identity ledger, while the Aries framework handles agents that manage credentials. Together, they allow entities to issue, hold, present, and verify credentials without exposing personal data on a public ledger. Indy suits organisations that want complete control over their identity infrastructure and possess the engineering capacity to operate it. The main trade‑off is the increased responsibility for implementation, governance, updates, and integration.

4. Privado ID

Privado ID combines DIDs, verifiable credentials, and zero‑knowledge proofs in an infrastructure that supports issuance and verification. Its underlying protocol, Iden3, maximises holder privacy by using zero‑knowledge proofs. A user can prove that a credential meets a verifier’s conditions—such as age or residency—without revealing the full credential. Privado ID follows SSI principles and implements Decentralized Identity Foundation standards. It also supports W3C‑standardised credentials and works with EVM‑compatible blockchains.

5. SpruceID

SpruceID builds identity infrastructure for issuing, holding, presenting, and verifying digital credentials. Its use cases span mobile vehicle licensing, professional credentials, government services, and fraud‑prevention workflows. SpruceID focuses on delivering a secure, scalable platform that simplifies the entire credential lifecycle for enterprises and public‑sector organisations.