Solidus Identity
Solidus Identity vs Mattr
Mattr is the credential platform banks and governments already trust; Solidus is the open protocol underneath, for buyers who'd rather hold their own keys than rent Mattr's.
Solidus is a public testnet: no mainnet, no token, no external audit, and no paying customer. Every claim below is checkable; none of them are a substitute for the certifications an incumbent already holds.
What Mattr does better
- BBS+ and SD-JWT VC in production for 4-5 years, with mDL/ISO 18013-5 compliance shipped — Solidus's BBS+ is testnet-only and unaudited.
- Live government deployments: New Zealand's digital health pass and driver's license, and the New South Wales Digital Driver Licence. Solidus has zero deployments and zero paying customers.
- A trust registry (issuer trust-list management) is a solved, operational Mattr product for their government customers — Solidus hasn't productized this yet.
- Direct participation in EUDI Wallet Large Scale Pilots and existing relationships with EU procurement bodies Solidus is still building.
Where Solidus is different
- Apache-2.0 open protocol vs Mattr VII, which is proprietary SaaS with only some SDK components open, per its own brief.
- did:solidus is registered in the W3C DID Method Registry and Solidus is a DIF Associate Member — a standards footing an open protocol needs and Mattr's closed platform doesn't.
- Native KYC issuance via verify.solidus.network in the same stack; Mattr's brief states it leaves KYC issuance to a partner such as Sumsub or Jumio.
- No enterprise contract minimum — Mattr's brief cites enterprise/government contracts running $100K-1M+ annually with low pricing transparency.
Side by side
| Feature | Solidus | Mattr |
|---|---|---|
| Production maturity | Public testnet, unaudited, no paying customer | 4-5 years in productionMattr wins |
| Deployment reference | None | NZ digital health pass and driver's license; NSW Digital Driver LicenceMattr wins |
| Trust registry | Not yet productized | Operational, solved for government customersMattr wins |
| Selective disclosure (BBS+ / SD-JWT VC) | Shipped on testnet, unaudited | Shipped in production, 4-5 yearsMattr wins |
| Architecture | Sovereign L1 protocol | Centralized SaaS (Mattr VII); no L1 or token |
| Credential custody | User-held keys | Mattr-hosted keys by default (customer-managed optional) |
| Native KYC / credential issuance | Native, via Verify | Deferred to a partner (e.g. Sumsub, Jumio), per brief |
| Source model | Apache-2.0, open protocol | Proprietary SaaS; core platform closed |
| Pricing | Free testnet, no enterprise minimum | Enterprise/gov SaaS, $100K-1M+/yr per brief |
Check it yourself
did:solidus is registered in the W3C DID Method Registry: curl -s https://api.github.com/repos/w3c/did-extensions/pulls/713 → state: closed, merged: true, merged_at: 2026-07-04.