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FactLockFile

FACTLOCK ECOSYSTEM · MOBILE LIVE CAPTURE + DESKTOP ARCHIVE COMMAND

If someone alters your evidence,
can you prove what the original was?

Preserve a verifiable original before the story changes. FactLockCam protects the original photo or video you capture on your phone and creates a signed record of its exact contents, anchored on Polygon when the phone is online. A small proof opens in the browser. A large proof opens in the free FactLockFile desktop Viewer, coming for Mac, Windows and Linux once each version is tested.

“If an important piece of evidence you have is later disputed by an altered copy, how do you prove you have the original?”

Create your first 5 records free on iPhone & Android.

Original media stays encrypted in your on-device Archive. Media is never uploaded or stored by FactLockCam. Polygon stores a fingerprint of the signed record, never your photo, video, or document.

  • 5 Free Mobile Captures
  • Protected .flcproof Original
  • Signed Manifest Digest on Polygon
  • Workstation: paid, coming later
  • Browser check for small proofs, no upload
  • Desktop Viewer: coming

with the FactLockCam app.

Tamper-evident archive · signed record · public-record anchor on Polygon.

Download for iPhone Get it on Android Open Browser Verifier
The FactLockCam camera screen on an iPhone, framing a guitar, with GPS, UTC time and Chain Live readouts.
Real FactLockCam capture screen Live camera view on iPhone

FACTLOCKCAM MOBILE APP · iOS & ANDROID (5 FREE CAPTURES)

Controlled Live Camera Capture Origin

Photos and videos are created inside FactLockCam’s controlled live-capture workflow. The app computes the SHA-256 fingerprint of the exact original bytes at capture, signs a canonical manifest, anchors the manifest digest on Polygon when online, and retains the encrypted original on your phone.

  • INGRESS: Live camera shutter only (Picture & Video) + optional device GPS
  • COMMITMENT: Exact-byte SHA-256 + signed ProofManifest v1 + Polygon digest anchor
  • TRIAL: Start free with 5 lifetime captures on the App Store and Google Play
Explore mobile live capture
▸ Your evidence can be challenged. Your preserved original can be checked.
▸ Change the copy. The earlier record still stands.
▸ When the evidence is questioned, establish what you preserved.
▸ Preserve the original. Verify the record.

Coming, not available yet.

Design preview with sample files. FactLockFile Workstation is a planned paid desktop app and is not in any plan today.

Workstation Interface · Interactive Preview

One proof family. Two ways in.

Explore the FactLockFile desktop workstation layout: a 230px command rail, Archive record grid, non-destructive local file sealing, and side-by-side manifest inspector.

FACTLOCK FAMILY / ARCHIVE WORKSTATION

On-Device Sealing Plus · 12/20 Seals Mo

The FactLock Ecosystem

Mobile live capture + Desktop Archive management & file reference sealing

Shared .flcproof Format
CAM 5 Free Captures

FactLockCam

Mobile Live Capture (iOS & Android)

Fingerprints photo and video bytes at the shutter, signs the capture record with your owner key (a software key held in the phone's secure storage), and anchors a fingerprint of that record on Polygon when online. The record also notes the phone's hardware-backed device key class.

FILE Coming · not in any plan

FactLockFile

Desktop Archive & File Seal

Organizes mobile .flcproof packages, prints Certificate PDFs, and non-destructively seals existing local PDFs, ZIPs, audio, and documents.

Archive Telemetry

Anchor the Original.

Change the file. Break the match. Verify it yourself at /open with zero upload.

Container Format
.flcproof (AES-GCM + PBKDF2-HMAC-SHA256)
Public Commitment
Polygon PoS · notarize(bytes32)

Trust Boundary

Exact file and signed record — not scene truth. Imported desktop files are recorded as sealed file references, never live camera captures.

01 / INSPECT

Magic-Byte & MIME Check

Reads local file headers in place without altering or deleting your source file on disk.

02 / SEAL

SHA-256 + AES-GCM Archive

Computes the SHA-256 digest in an isolate, signs the capture record, and encrypts into your local Archive.

03 / ANCHOR

Polygon Manifest Digest

Commits the 32-byte manifest digest to Polygon and exports self-contained .flcproof packages.

The Essential Product Insight

Why an uncontrolled copy fails—and why your preserved .flcproof original stands.

Media handled by messaging services, claim portals, format converters, metadata processors, or image tools can be changed in transit—even when it looks visually identical. A cryptographic exact-byte hash cannot survive those transformations. FactLock is built around preserving and authenticating your protected reference original.

Three-stage evidence dispute walkthrough: Preserve the Original, Disputed Copy Diverges, and Authenticate the Preserved .flcproof Reference

  1. STAGE 01 · BEFORE THE DISPUTE

    Preserve the Original & Public Commitment

    A claimant captures property damage in FactLockCam (or seals a contract in FactLockFile). The app computes the exact-byte SHA-256 fingerprint, signs the canonical manifest, anchors the 32-byte manifest digest on Polygon, and retains the encrypted original in the Archive.

    Protected .flcproof reference created

  2. STAGE 02 · MONTHS LATER (THE CHALLENGE)

    A Portal or Counterparty Copy Diverges

    Months later, an insurer, agency, or opposing party presents a different-looking or re-encoded version and questions the evidence. Because external portals recompress files and strip headers, uncontrolled copies regenerate a different SHA-256 hash (media_hash_mismatch).

    Different bytes ≠ proof of who changed it

  3. STAGE 03 · AUTHENTICATE THE REFERENCE

    Produce the Retained .flcproof Original

    The claimant produces the retained .flcproof package from their Archive. The examiner opens it locally at factlockcam.com/open and independently validates its exact media fingerprint, signed manifest, and earlier Polygon transaction—establishing what was preserved before the dispute.

    File · Signature · Public Record verified

Two Instruments · Explicit Trust Boundaries

Live capture on your phone today. Desktop Archive and file sealing later.

One shared cryptographic philosophy across distinct acquisition boundaries. Mobile FactLockCam is strictly a live camera so field photos carry capture-time provenance. FactLockFile Workstation, coming later as a paid desktop app, will manage your Archive and seal files you already have.

MOBILE APP · iOS & ANDROID First 5 Lifetime Captures Free

FactLockCam — Controlled Live Capture

Establishes a verifiable protected original inside the live camera capture workflow before any editing app, camera roll, or messaging platform touches the bytes.

  • Controlled live shutter capture for Picture and Video evidence
  • Exact-byte SHA-256 fingerprint + signed canonical capture manifest
  • Optional device-reported shutter GPS sealed inside the .flcproof package
  • Offline-ready local AES-256-GCM Archive; anchors manifest digest to Polygon when online
  • Unmetered Send Proof (.flcproof) and printable Audit Certificate PDFs
Download for iPhone Get it on Android
DESKTOP APP · macOS, WINDOWS & LINUX Coming, not available yet

FactLockFile — Archive Management & File Reference Seal

Turns your workstation into an evidence archive command center for mobile captures, and seals preexisting desktop files from the moment of import forward.

  • Archive Management: Organize, inspect, and audit mobile .flcproof packages by claim or project
  • Certificate Studio: Batch-export printable Audit Certificate PDFs and proof.json manifests
  • Preexisting File Seal: Import PDFs, contracts, CAD exports, audio, and ZIP archives
  • Non-Destructive Ingress: Hashes and encrypts a copy into your Archive while preserving your original file on disk
  • Explicit Boundary: Establishes a protected reference from sealing forward without claiming pre-import history
Full Pricing Catalog
Primary Role in Workflow
FactLockCam Live field capture of photos & videos at the scene
FactLockFile Desktop Archive management, claim organization & preexisting file sealing
Acquisition Trust Boundary
FactLockCam Controlled live camera workflow (no camera-roll import)
FactLockFile Imported preexisting file or synced .flcproof package (no pre-import history claim)
How You Get Access
FactLockCam Free download on App Store & Google Play (5 free lifetime seals)
FactLockFile Included as a paid service with Standard, Plus, and Pro mobile subscriptions
Source File Behavior
FactLockCam Temporary camera buffer is wiped immediately after encrypted Archive write
FactLockFile Original working file on your computer drive is preserved untouched
Cryptographic Commitment
FactLockCam SHA-256 of media bytes → signed ProofManifest v1 → 32-byte manifest digest on Polygon
FactLockFile Identical ProofManifest v1 & Polygon manifest digest notarization
Counterparty Verification
FactLockCam Zero-upload browser check at factlockcam.com/open
FactLockFile Zero-upload browser check at factlockcam.com/open

Plans

Start free on your phone. Your first 5 records are free.

Every user starts with 5 free lifetime captures in the FactLockCam mobile app. Upgrading to Standard, Plus, or Pro in the App Store or Google Play increases your monthly seal allowance.

Compare full plans
  • Free

    $0 forever

    5 lifetime seals

    Mobile Live Capture + Browser Verifier

    • 5 lifetime live-camera seals on iOS & Android
    • Full SHA-256 + signed manifest + Polygon anchor
    • Unlimited Send Proof (.flcproof) & Certificate PDFs
    • Zero-upload verification at factlockcam.com/open
    Start 5 Free Captures (iOS) Start 5 Free Captures (Android)
  • Standard

    $2.99 / month ($29.99/yr)

    10 seals / month

    FactLockFile desktop app: coming

    • 10 seals every month
    • Unlimited Send Proof & Certificate Studio exports
    • Monthly or annual billing
    Subscribe in App (Standard) Get on Google Play
  • Plus Recommended

    $5.99 / month ($49.99/yr)

    20 seals / month

    FactLockFile desktop app: coming

    • 20 seals every month + Incident Pack overflow
    • Unlimited Send Proof & Certificate Studio exports
    • Built for landlords, contractors & field teams
    Subscribe in App (Plus) Get on Google Play
  • Pro

    $12.99 / month ($129.99/yr)

    Unlimited seals

    FactLockFile desktop app: coming

    • Unlimited monthly seals
    • High-volume claim, inspection & legal archive workflows
    • Priority support & full backup/restore portability
    Subscribe in App (Pro) Get on Google Play

Incident Pack · $9.99 One-Time

10 seals that never expire

A one-time purchase for a bad week. Packs stack, never expire, and are used only after your plan allowance is spent.

See full pricing details

Coming, not available yet

Desktop File Sealing & Archive Support

Manage mobile photos & videos alongside sealed desktop documents.

FactLockFile Workstation, when it is available, will organize mobile camera captures and seal preexisting workstation files into the same .flcproof container format.

01 · MOBILE .FLCPROOF ARCHIVES image & video

Field Photos, Videos & Inspection Packages

Synced .flcproof packages · image/jpeg · image/heic · video/mp4 · video/quicktime

Import and organize .flcproof packages captured on iPhone or Android. Inspect full-resolution evidence, review device-reported GPS and Polygon block windows, and print Audit Certificate PDFs.

Provenance & Custody Boundary

Preserves mobile capture provenance & device_key_class disclosure

02 · PREEXISTING DOCUMENTS document

PDFs, Contracts, Estimates & Structured Reports

application/pdf · .docx · .csv · .json · .txt · .md

Seal signed agreements, adjuster estimates, engineering reports, or financial schedules on your computer so any later byte modification is immediately detectable.

Provenance & Custody Boundary

Establishes a verifiable reference from sealing forward

03 · ARCHIVES & CASE BUNDLES archive

ZIP, TAR, GZIP & Discovery Productions

application/zip · application/x-tar · application/gzip

Seal multi-file claim folders, release bundles, or discovery sets as a single deterministic SHA-256 digest anchored to a Polygon block window.

Provenance & Custody Boundary

Single 32-byte manifest commitment covers the entire archive

04 · AUDIO & ENGINEERING FILES audio & binary

WAV, MP3, M4A, CAD & Binary Exports

audio/wav · audio/mpeg · audio/mp4 · application/octet-stream

Anchor raw audio recordings, compliance logs, or CAD files in a background worker isolate while leaving your original working file untouched on disk.

Provenance & Custody Boundary

Source file stays intact on disk; encrypted copy enters your Archive

Cryptographic & Evidentiary Precision

Exact mechanisms and honest boundaries—no overclaims.

Marketing claims must be backed by reproducible functionality. FactLock separates what cryptography proves from what still requires human facts and chain-of-custody records.

What a Passing Verification Check Proves

  • The protected file inside the .flcproof package matches the exact SHA-256 byte fingerprint recorded in the signed manifest.
  • The capture record was signed by the owner key, a software key held in the phone's secure storage. It also discloses the phone's device key class, which is hardware-backed where the phone has it.
  • When anchored online, the 32-byte manifest digest existed on Polygon no later than the verified transaction block.
  • Any byte-altering edit, recompression, or metadata strip on another copy will produce a different SHA-256 hash.

What Verification Does Not Claim

  • Does not prove the photographed physical scene was true or that a document’s text is factually accurate.
  • Does not independently attest a person’s identity, device clock, or GPS reading (time and GPS are device-reported; Polygon provides the public existence-time bound).
  • Does not prove a file was unaltered before the capture or desktop import trust boundary.
  • Does not prove why a third-party copy has a different hash or who modified it, and does not promise that a court will accept the file.

SHA-256 Exact-Byte Fingerprint

A one-way cryptographic hash function that produces a 32-byte commitment to exact file bytes. SHA-256 does not encrypt files, generate keys, or store a recoverable copy of your media.

AES-256-GCM Authenticated Encryption

Encrypts and authenticates your original media inside your local Archive (.seal) and inside shared .flcproof packages (derived via PBKDF2-HMAC-SHA256 with 210,000 iterations).

Signed Manifest Digest vs. Media Hash

FactLock signs a canonical JSON manifest (ProofManifest v1) containing the media SHA-256, byte length, MIME type, UTC timestamp, owner address, and device key class. The 32-byte SHA-256 digest of that manifest—not your photo or document—is anchored on Polygon.

How This Relates to C2PA Content Credentials

C2PA supports both embedded metadata and external manifests, though embedded headers are often stripped by messaging apps and upload portals. FactLock pairs a public Polygon manifest digest commitment with an owner-held encrypted .flcproof package containing the preserved reference bytes.

Rigorous evidentiary claim: “This protected file matches the exact bytes identified by the signed capture record, and that record’s commitment existed no later than the verified Polygon transaction.” Verifies the exact file and signed record—not the physical truth of the scene.

Verify it yourself

Fingerprint any file. Right here. Nothing leaves this page.

Drop a photo, a PDF, anything. Your browser computes the SHA-256 fingerprint locally with WebCrypto — the same function FactLockCam runs at capture. Re-save the file with one change and drop it again: the fingerprint will not match.

  • Drop any photo, PDF, ZIP, audio, or document
  • Computed locally with window.crypto.subtle
  • Re-save with one change to see media_hash_mismatch
Local file fingerprint SHA-256 · in this browser
File
Waiting for a file
Size
—
SHA-256
—
Time
—

This demo hashes the bytes you choose and keeps them in memory only. It is not a signed record or a public anchor — FactLockCam adds those at capture.

FactLockFile desktop Viewer · coming

Large proofs

A proof is large when the photo or video inside it is 25 MiB or more. A large proof opens in the free FactLockFile desktop Viewer, coming for Mac, Windows and Linux once each version is tested.

The Viewer will be free and need no account. It will open a .flcproof file on your computer, take the unlock key, and show the file, the signature, and the public record as three separate results. It will play the media on your computer and will be able to save the checked copy. Media is never uploaded or stored by FactLockCam.

  • Small proofs open in the browser at factlockcam.com/open today.
  • A large proof arrives as two files: the .flcproof proof and a note named factlockcam-unlock-key.txt. You do not create a password. When the note is in the same folder as the proof, the Viewer will fill in the key.
  • Have a large proof now? Save both files in the same folder and keep them. Without the key, the file cannot be opened.
  • FactLockFile Workstation, the planned paid desktop app, is separate. You will not need it to open a proof.

Each download goes live only after that version is tested.

Ecosystem & Subscription FAQ

Straight answers on disputes, mobile capture, desktop Archive access, and verification

Inspect the full threat model, compare subscription plans, or verify a package on /open.

01 If someone alters my file, how does FactLockCam help me show what the original was?
When you capture a photo or video in FactLockCam, the app keeps the exact original encrypted in your Archive, seals its SHA-256 fingerprint into a signed capture record, and anchors a fingerprint of that record on Polygon when the phone is online. If a later copy is compressed, stripped, or edited, you send the original as a .flcproof proof. A small proof opens in the browser at factlockcam.com/open. A large proof opens in the free FactLockFile desktop Viewer, coming for Mac, Windows and Linux once each version is tested. The file, the signature, and the public record are checked separately, and media is never uploaded or stored by FactLockCam.
02 How do FactLockCam and FactLockFile fit together?
FactLockCam on iPhone and Android is the camera, and your first 5 records are free. The FactLockFile desktop Viewer will open large proofs. It will be free, will need no account, and is coming for Mac, Windows and Linux once each version is tested. FactLockFile Workstation is a planned paid desktop app for managing your Archive and sealing files you already have. It is coming later and is not in any plan today. Checking a proof is never a paid feature.
03 Why doesn’t a re-saved or portal-uploaded copy match?
An ordinary file copy that preserves all bytes keeps the exact same SHA-256 fingerprint. However, messaging apps, email gateways, format converters, and insurance portals routinely re-encode images or rewrite metadata headers—changing the underlying bytes even when the picture looks identical. That is why retaining the protected original inside a .flcproof package is essential.
04 What is the difference between a live capture and sealing an existing file?
FactLockCam makes the protected original at the moment you press the shutter. FactLockFile Workstation, when it is available, will make a protected reference when you import and seal a file you already have. It makes no claim about that file's history before sealing. Workstation is coming later and is not in any plan today.
05 Does checking a proof upload my photo, video, or file?
No. A small proof opens at factlockcam.com/open, which decrypts and checks it in your browser. A proof is large when the photo or video inside is 25 MiB or more. A large proof opens in the free FactLockFile desktop Viewer, coming for Mac, Windows and Linux once each version is tested. It stays on your computer. Media is never uploaded or stored by FactLockCam. The public-record check looks up only the Polygon transaction.
06 Does a passing check prove the scene was true or promise that a court will accept the file?
No. A passing check proves that the protected file matches the exact bytes identified by the signed capture record and that the record’s commitment existed no later than the verified Polygon transaction. It does not prove the physical scene was true, attribute who altered another copy, or promise that a court will accept the file. Times shown come from two places: the phone's own clock, which no one else checks, and the Polygon block, which shows the record existed no later than that block.

Anchor the Original Before the Story Changes

Create your first 5 records free on iPhone or Android.

Start with the FactLockCam mobile app to capture and seal live evidence for free. Upgrade anytime for more records each month. The FactLockFile desktop app is coming and is not in any plan today.

with the FactLockCam app.

Tamper-evident archive · signed record · public-record anchor on Polygon.

Download for iPhone Get it on Android Open a proof package