Atomic Presence
Anchor of Reality
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Capture verifiable, authentic moments. Atomic Presence uses cryptographic hash chains and digital signatures to deliver trusted, on-device proof of media integrity.
Atomic Presence: Your Fortress of Digital Truth
When your recorded words matter, Atomic Presence provides cryptographic proof that they are authentic and unaltered. Built for interviewees, journalists, and legal preservation — it gives you the power of technical self-verification.
Key Features:
Cryptographic Hash Chain — Real-time SHA-256 hash sequence encoded into dynamic QR codes, embedded directly into video. Mathematical continuity makes any modification detectable.
On-Device Digital Signatures — Curve25519 via Apple's CryptoKit, key stored in iOS Keychain, ensures non-repudiation of source.
FSK Audio Watermark — Near-ultrasonic (18/19 kHz) FSK signals embedded in audio; even if extracted, integrity can still be verified. Lossless mode embeds an implicit watermark for additional integrity assurance (min 15 seconds).
Sovereign Mode — Front-facing camera recording with live QR code overlay, paired with digital signatures for the strongest video evidence. Thermal and memory monitoring keep long recordings stable.
Built-in Forensic Verifier — Directly verify Level 2 / Level 3 recordings, or import an external video that captured Level 1 QR overlays. Frame-by-frame QR extraction and hash chain recomputation produce a detailed integrity report.
Four Professional Tiers:
Level 0 — Screensaver: basic visual presence proof with customizable logo text (1–6 chars).
Level 1 — Alert: Picture-in-picture hash chain for external-device capture; verify integrity by importing the external recording afterward.
Level 2 — Witness: High-quality audio recording with FSK watermark embedding. Lossless (ALAC) mode provides implicit watermark verification (min 15 s).
Level 3 — Sovereign: Front-facing recording with live QR overlay, digital signature and file checksum — the strongest preservation tier.
Evidence Management
Star important recordings, add notes, share via AirDrop or the Files app. Auto-stop timer (30 min – 3 hours) prevents unintended long recordings. All evidence stored locally and accessible via the iOS Files app.
Personalization
Three visual themes — Terminal (cyberpunk green), Natural Light, Natural Dark — choose what fits your environment.
Privacy-First
100% On-Device: hashing, signing, and media processing all happen locally.
No Data Collection: no recordings or identity data are collected, stored, or transmitted.
Offline-Capable: works without any network connection.
Capture verifiable truth. Make your evidence trustworthy.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
v1.2 — Now in 11 languages, including German, Spanish, and Brazilian Portuguese. Hardware keyboard shortcuts on iPad and Mac.
The developer, chengche lee, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- chengche lee
- Size
- 4.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 10 more
- English, French, German, Indonesian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish, Traditional Chinese, Vietnamese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Chengche Lee