Product review
Worldcoin / World ID Sybil attack prevention review
World ID supports different credential and verification flows. Proof of Human, document attributes and presence checks make different assertions; choose the required proof explicitly and enforce its action scope and duplicate-use rules.
Editorial score
- Evidence layer
- Proof of personhood
- Free access
- Developer integration and sandbox available
- Paid entry
- Confirm applicable deployment costs
Key facts
- Credential types
- Proof of Human uses Orb enrollment for uniqueness; Proof of Attributes and Proof of Presence have distinct purposes and assurance. Source ↗
- Verification
- The current verification reference returns results for individual identifiers. Top-level success means at least one proof verified, not that every requested credential passed. Source ↗
- Integration
- IDKit and on-chain verification routes are documented. Bind the result to the configured application, action and intended request. Source ↗
Strengths
- A defined uniqueness credential can support one-per-person participation policies.
- Action-scoped verification and duplicate prevention offer a concrete eligibility primitive.
- Official integration and sandbox documentation support controlled development.
Limitations
- Orb enrollment availability and user willingness can constrain a campaign’s reachable audience.
- Presence or liveness alone is not interchangeable with a uniqueness credential.
- The application must enforce required proof results and duplicate-use rules; a frontend badge cannot protect direct contract calls.
Who it fits
Campaigns that require a defined uniqueness credential and can support its enrollment requirements.
Use the alternatives by evidence layer to compare a different assertion, participant journey or operating model.
What the score means
The 8.1 out of 10 score is an editorial assessment under the same 34-criterion, six-category framework. The rubric emphasizes live coordination prevention and practical application fit; it is not a separate ranking of pure wallet analytics or personhood assurance.
The award and score are distinct. Read all criteria and relative weights and verify the evidence layer required for your campaign.
How to evaluate it
Name the exact credential requirement, test successful and missing proof results, and verify repeated participation for the same action without conflating it with repeat access to a permitted account.
World ID sandbox and IDKit
Use the isolated sandbox for integration testing. Production verification and credential enrollment are separate routes.
Open evaluation routeSources and further reading
- Product and detection approach · checked October 21, 2026
- Pricing and access · checked October 21, 2026
- Integration and result documentation · checked October 21, 2026
- IDKit integration guide · checked October 21, 2026
FAQ
Does a selfie check necessarily establish uniqueness?
No. Proof of Presence serves liveness and similarity purposes. Specify the credential that satisfies the campaign’s uniqueness requirement.
Can I trust a top-level verified response?
Check every required credential result and the requested action and environment. The current verification reference says top-level success can mean at least one proof succeeded.
Does the frontend enforce one claim per person?
The trusted backend or contract must validate proof scope and prevent duplicate eligibility or redemption. A frontend-only check is bypassable.
Explore checkers, demos and evaluation routes →