# Verifiable Product Review The **Verifiable Product Review** feature enables **authentic, tamper-resistant product reviews** by linking every rating and feedback entry to a **verified proof of purchase**.\ Unlike traditional review systems, DEXPIRY ensures that only real buyers can leave feedback, eliminating fake reviews, bots, and incentive-driven manipulation. *** ### Purpose Most online review platforms suffer from unreliable feedback caused by: * fake or paid reviews, * reviews from non-buyers, * duplicate or manipulated ratings. DEXPIRY solves this problem by using **warranty tokens as cryptographic proof of purchase**, making every review verifiable and trustworthy. *** ### Token-Based Proof of Purchase Each purchased product or service issued through DEXPIRY is represented by a **token** that confirms: * the product identity, * the time and place of purchase, * the issuing seller or service provider. The token acts as a **verifiable purchase credential** that cannot be forged or duplicated. Only **Basic Users who currently hold a valid token for a specific product or service** are eligible to submit a review. *** ### Who Can Leave a Review To submit a review, a user must: * own a DEXPIRY token representing the reviewed product or service, * be authenticated as the current token holder. This ensures: * one review per valid purchase, * no reviews from non-customers, * no review farming or artificial inflation. *** ### Review Submission Flow 1. Basic User selects a product linked to their token 2. User submits: * rating (e.g. stars or score), * written feedback (optional) 3. Review is permanently linked to the token ID 4. Review becomes publicly verifiable as “Purchased & Verified” The system allows optional aggregation and anonymization while preserving verifiability. *** ### Why Reviews Cannot Be Manipulated DEXPIRY prevents review manipulation by design: * reviews are **token-gated**, * tokens are issued only at purchase, * ownership is cryptographically verifiable, * reviews cannot be duplicated or edited by sellers. DEXPIRY is currently **the only system** that combines **proof-of-purchase, ownership verification, and immutable audit trails** in a single review infrastructure. *** ### Applicability Across Products and Services The Verifiable Product Review feature applies to: * physical products, * digital goods, * subscription services, * repairs and service interactions. Any product or service that issues a DEXPIRY token can use this functionality. *** ### Benefits * Trustworthy, purchase-verified reviews * No fake or paid reviews * Higher consumer confidence * Fair representation of product quality * Improved decision-making for buyers *** Verifiable Product Reviews transform feedback from opinion-based signals into **verified trust indicators**.\ By requiring token ownership as proof of purchase, DEXPIRY creates a review ecosystem where authenticity is guaranteed and manipulation is structurally impossible. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.dexpiry.com/dexpiry_public_eng/extra-use-case-models/verifiable-product-review.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.