CCTV Police Evidence & Form MG11 Checksum Calculator
Calculate NVR time drift offsets, generate SHA-256 digital cryptographic hashes directly in your browser with zero server uploads, and compile court-admissible witness statement excerpts for investigating police officers.
1 NVR Clock Drift vs Atomic Time
2 Surveillance Hardware & Channel Details
3 Client-Side SHA-256 Cryptographic Hasher
Drop your exported CCTV file here to calculate its cryptographic fingerprint in browser memory. ✓ 100% Private (File is NEVER uploaded to any server).
Click or drag & drop video file (.dav, .mp4, .264)
Computes Web Crypto SHA-256 locally
STATEMENT OF WITNESS (CJ Act 1967, s.9; MC Act 1980, ss.5A(3)(a) and 5B; MC Rules 1981, r.70)
I am the owner/manager responsible for the digital electronic surveillance system fitted at the premises.
On 6 November 2026, I exported video surveillance data covering the period from 22:15:00 to 22:42:00 from Channel 2 (Driveway / Front Entrance).
The recording equipment is a commercial Dahua Technology recorder. Prior to extraction, I verified the internal system clock against speaking/atomic time. The system clock was running 3 minutes and 15 seconds SLOW.
The footage was downloaded in its native raw digital stream format with proprietary watermarking intact to preserve evidentiary integrity under BS EN 62676-4. The manufacturer standalone viewing tool was included on the storage media.
I have sealed the storage media into Police Evidence Bag, labelled as:
EXHIBIT: GP/01
SHA-256 HASH: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
I certify that the evidence has not been tampered with or altered in any manner.