Proof Token: How a Review Becomes Provable
A Proof Token is a unique cryptographic identifier that links a customer review to a specific business transaction. It is the foundational element of the VeriBureau protocol — the mechanism that distinguishes a verified review from an unverified opinion.
The structural problem
In traditional review systems, a review exists because someone wrote it. The platform may apply post-publication checks — AI detection, human moderation, user reporting — but the review's existence does not depend on evidence of a transaction. This creates an asymmetry: publishing a review is trivially easy, while verifying its legitimacy is expensive and imperfect.
What the data shows
The economic research is clear on the consequences. A Harvard Business School study (Luca, 2016) found that a one-star increase on Yelp leads to a 5–9% increase in revenue for restaurants. When the incentive to manipulate ratings is this strong and the barrier to publishing is this low, manipulation becomes economically rational. This is not a moral judgment — it is a structural observation.
Sources: FTC enforcement actions, Trustpilot Transparency Reports, academic research on review platform economics.
The VeriBureau approach
A Proof Token is generated via the VeriBureau API or dashboard after a transaction occurs. It contains a cryptographic hash linking the business identifier, a transaction reference, and a timestamp. When a customer uses this token to submit a review, the review is permanently bound to the transaction. The token is single-use and time-limited. It can be delivered via email, QR code, or integrated into existing checkout flows.
Limitations and honest disclosure
The Proof Token is generated by the business, not by an independent third party. This means a business could generate tokens without real transactions. We address this through statistical analysis of token patterns, reviewer independence checks, and the public audit chain — but we acknowledge this as a known limitation. Future versions of the protocol may incorporate third-party transaction verification (payment processors, POS systems) to strengthen this layer.
Frequently asked
Is VeriBureau free?
Yes. During the founding period, all features are free with no limits. Future pricing will be per-token, not subscription — announced with advance notice.
Is VeriBureau immune to fake reviews?
No system is immune. VeriBureau raises the cost of fake reviews significantly by requiring cryptographic proof of transaction, but a business could theoretically generate tokens for fictitious transactions. We mitigate this through pattern analysis and the public audit chain, and we are transparent about this limitation.
How long does integration take?
Dashboard registration takes 2 minutes. API integration depends on your stack — most developers complete it in under an hour. No-code options (email invitations, QR codes) work immediately.
Verify it yourself
Read the technical specification. Generate a test token.