Proof Keep
Secure Evidence Collection with Blockchain Verification
Download Proof KeepFree version with 5GB encrypted cloud storage included
Secure Evidence Collection with Blockchain Verification
Download Proof KeepFree version with 5GB encrypted cloud storage included
Choose your protection package and secure your evidence collection
All storage packages include end-to-end encryption. Premium features require account registration. Blockchain verification available on packages 50GB and above. Storage validity: 12 months from activation with option to extend.
Proof Keep implements a three-layer verification architecture that captures, timestamps, and secures evidence in real-time. The moment you photograph a document or record an event, the app generates a SHA-256 hash fingerprint and registers it on a distributed ledger, creating an immutable proof of existence that cannot be backdated or altered.
Every piece of evidence you collect is wrapped in metadata layers that record device ID, GPS coordinates with accuracy radius, network conditions, and sensor data. This forensic-grade documentation ensures that your collected proof maintains legal integrity from capture to courtroom presentation, with automatic generation of audit trails that satisfy evidentiary standards.
All captured data undergoes AES-256 encryption before leaving your device. The app uses a zero-knowledge architecture where encryption keys are derived from your biometric authentication, meaning even Proof Keep servers cannot decrypt your stored evidence. Multi-factor authentication and selective sharing controls let you grant temporary access to legal counsel or investigators without compromising security.
Every piece of evidence receives an immutable timestamp registered on a public blockchain. This cryptographic proof establishes the exact moment of capture, preventing any possibility of backdating or temporal manipulation. The timestamp includes block height, transaction hash, and verification URL for independent audit.
Collect photographs with EXIF preservation, record audio with waveform analysis, capture video with frame integrity checks, scan documents with OCR text extraction, and log GPS coordinates with satellite count verification. Each format receives format-specific metadata that enhances evidentiary value.
Automatic synchronization to encrypted cloud storage ensures your evidence survives device loss or damage. The backup system uses client-side encryption where files are encrypted on your device before upload, with encryption keys never transmitted to servers. Redundant storage across multiple geographic regions provides disaster recovery protection.
Generate comprehensive audit reports that document every interaction with collected evidence. The system tracks who accessed what evidence, when, from which device, and what actions were performed. These reports export to PDF format with digital signatures and can be submitted directly to legal proceedings.
Share evidence with attorneys, investigators, or authorities using time-limited access links with customizable permissions. Set expiration dates, view-only restrictions, download limits, and watermarking. All sharing events are logged in the chain-of-custody record with recipient identification and access timestamps.
Advanced integrity verification algorithms continuously monitor stored evidence for any signs of modification. The system compares current file hashes against blockchain-registered fingerprints and alerts you immediately if discrepancies are detected. This ensures your evidence remains pristine from collection to presentation.
SecureChain Labs specializes in cryptographic documentation systems for legal and investigative professionals. Proof Keep represents their flagship mobile application, combining forensic-grade evidence collection with consumer-friendly interface design.
Current version 2.1.4 released August 2026 introduces enhanced blockchain verification speed and expanded cloud storage tiers. The platform serves over 15,000 legal professionals, private investigators, and individuals requiring court-admissible documentation.
Available exclusively for Android 8.0 and higher with planned iOS release scheduled for Q3 2025.
Free on Android 8.0 and higher. No subscription required for basic features. Blockchain verification included. Installs in under 90 seconds.
Download for AndroidRequires Android 8.0 or later. Free version includes 5GB encrypted storage. Premium features available via in-app purchase. Age rating: Everyone.