ProofLedge: Evidence Verifier

ProofLedge is a local-first workstation for digital evidence: photos, videos, audio, documents and files you need to keep, check and explain later.

WHAT IT DOES

• Preserves: each file you pick is read once through the Android document picker into an in-app acquisition copy. The source document is never modified.

• Verifies: SHA-256 (plus MD5 and SHA-1 for interoperability) is computed while the file is read and again on the copy; the file is imported only if both match. Re-verify any time.

• Identifies: the real file type is read from the content (about 120 signatures), not from the file name, so a renamed or disguised file shows up as a mismatch.

• Reads metadata: EXIF and camera data, GPS (flagged as a privacy finding), PDF and Office document properties, XMP edit history, C2PA manifest presence, video and audio container details.

• Compares: two files side by side with hashes, metadata differences and similar-image candidates.

• Timeline: dates from metadata, file system and your own notes on one time axis, with the source of every entry.

• Audit log: every action is written to a hash-chained, append-only log you can verify.

• Reports and Case Packages: export an HTML/JSON report or a signed Case Package (Ed25519) that anyone can re-verify with ProofLedge.

HOW TO READ THE RESULTS

ProofLedge reports observations: match, mismatch, observed, or inconclusive. It does not declare a file genuine or forged and does not replace a qualified forensic examiner.

PRIVACY

• No account, no ads, no tracking SDKs.

• Your files and case data stay on the device and are excluded from cloud backup.

• The app works offline. The only network request is an optional license-revocation check you start yourself.

ANDROID EDITION

Folder import, folder snapshot comparison and the opt-in AI explanation are available in the Windows desktop app (proofledge.com). App languages: English and Korean.

Questions: projectteamforyou@gmail.com