carseal

Rented a car and got charged for a scratch that was already there? carseal helps you document photographed condition with hashes.

Before you drive off, carseal walks you through a guided walk-around plus required close-ups. Plan several minutes. Every kept photo is hashed: a cryptographic fingerprint (SHA-256), a Merkle tree over the whole set, an RFC-3161 timestamp token when the authority is reachable, and location when the device provided it. That combination documents photographed condition. It is tamper-evident as far as the hash and timestamp design. It does not guarantee a charge will be reversed.

At return, you scan again. carseal runs an AI-assisted review of possible changes since pickup. Possible change needs review; this does not establish who caused it. You get a tamper-evident PDF Return Certificate with highlighted areas on the photos, and a public check link for listed hashes.

If a charge lands anyway, one tap builds a dispute packet — a written rebuttal citing your sealed hashes, ready for the rental desk, your card issuer's chargeback, or your insurer. A reversal is not guaranteed.

HOW IT WORKS
1. Scan at pickup — a guided walk-around shows you live which parts of the car are still uncovered.
2. Drive.
3. Scan at return — same guided flow, including required close-ups.
4. Get your Return Certificate — before/after comparison, approximate highlighted areas on the photos, listed hashes on a public check link.
5. Dispute in one tap if you are charged — the packet cites your hashes; it does not guarantee the charge is reversed.

WHAT THE RECORD CONTAINS
• Per-photo SHA-256 + Merkle tree — a changed pixel changes the listed hash
• RFC-3161 timestamp token — when the authority responds; not assumed on every scan
• Location included when the device provided it — never “every photo is GPS-tagged”
• Append-only custody log — not object-lock retention on stored media
• A public check link and QR code on every certificate (listed hashes)

AI-ASSISTED REVIEW
carseal's vision models mark possible scratches, dents, cracks, missing parts and interior damage as an aid for review. Marks are AI-detected areas — not yet human reviewed. Scores are not calibrated probabilities. When the model is unsure, it leans toward calling damage pre-existing. Every finding is shown on the photo so you can judge for yourself.

PRICING
carseal is free to download. Protection credits are a one-time purchase, not a subscription. One credit covers one car end to end: the pickup scan, the return scan, and the Return Certificate. Buy a single protection or a 3-pack; the price in your currency is shown at checkout.

PRIVACY
Your scans are yours. Analytics and crash reporting stay switched off until you opt in, and you can delete your account and its data from Settings at any time.

Available in English, Romanian, German, French, Spanish and Italian.