Atomic Presence: Audio Proof

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.

----- cross-promo (auto-generated; do not edit) ----- More from the developer: Auditory Companion · Afterglow · English N+1 · Gantt Planet — Search «ChengChe Lee» on the App Store.