Solidus Network
Solidus vs Billions Network
Billions Network, formerly Polygon ID, is the best-funded ZK-identity project in the world with real enterprise customers. Its iden3/Circom proof format is proprietary to its own ecosystem; a Solidus credential is a W3C Verifiable Credential any relying party can check without adopting that ecosystem.
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 Billions Network does better
- $30M raised on a $1B+ valuation track — the strongest funding position in this entire category. Solidus has no disclosed funding round to compare.
- 2.5M+ verified users and named enterprise customers: HSBC, Sony Bank, the Government of India, and TikTok. Solidus has no customers, paying or otherwise.
- Polygon and Disco pedigree — brand equity the "Polygon ID" name still carries even after the rebrand.
- A battle-tested Circom/iden3 ZK stack in production since 2021 (as Polygon ID). Solidus's BBS+ implementation is newer and unaudited.
Where Solidus is different
- did:solidus is a W3C Verifiable Credential any relying party can check with a standard resolver; Billions' iden3/did:polygonid proofs need the Polygon CDK ecosystem to verify, per its own brief.
- BBS+ and SD-JWT VC — an EU/EUDI-aligned credential model, unaudited and conceded as such — against Billions' bespoke Circom/iden3 ZK stack, which the brief itself flags as not EUDI-interoperable.
- did:solidus is registered in the W3C DID Method Registry (PR #713, merged 2026-07-04) — a public entry a stranger can check in under a minute.
Side by side
| Feature | Solidus | Billions Network |
|---|---|---|
| Funding raised | None disclosed | $30M raised, $1B+ valuation trackBillions Network wins |
| Verified users | None — testnet, no paying customer | 2.5M+ verified usersBillions Network wins |
| Named enterprise customers | None | HSBC, Sony Bank, Government of India, TikTokBillions Network wins |
| Credential format | W3C VC 2.0 / SD-JWT VC / BBS+ (unaudited) | Proprietary iden3/Circom ZK proofs |
| Verifier interoperability | Any W3C VC-compatible relying party | Requires the Polygon CDK ecosystem, per brief |
| EU / EUDI standards alignment | BBS+ / SD-JWT VC — EUDI-aligned model (unaudited) | Bespoke ZK stack — not EUDI/W3C VC interoperable, per brief |
| DID method registered in W3C registry | did:solidus — registered 2026-07-04 | did:iden3 / did:polygonid — not stated as W3C-registered in source brief |
| Production maturity | Public testnet, unaudited | In production since 2021 (as Polygon ID)Billions Network wins |
Check it yourself
curl -s https://api.github.com/repos/w3c/did-extensions/pulls/713 → merged: true, merged_at 2026-07-04.