When footage has to survive scrutiny, trust is the wrong foundation. Nevtech VMS is built so that the evidence carries its own proof: cryptographic fingerprints from the moment of capture, a tamper-evident record of every hand that touched it, and exports a third party can verify with no Nevtech software and no Nevtech account. Verification rests on mathematics, not on certificates — anyone can check the math.
A SHA-256 hash is computed for every recorded segment and stored in its evidence manifest. From that moment, any change to the footage — a single re-encoded frame, a trimmed second — produces a different hash, and the mismatch is detectable by anyone who can run a hash function.
Segments are fingerprinted as they are stored and recorded in the evidence manifest, with the writer and capture window alongside — the record of what was captured is created with the capture, not reconstructed later.
Footage recorded through a network dropout is hashed on the device itself before upload, with a per-shift session and an unbroken sequence number. The server recomputes the hash on arrival: a mismatch is rejected and written to the audit log, and a gap in the sequence is provable, not silent.
The custody report runs automated integrity checks per item and states each result affirmatively — what is proven, and by which mechanism — rather than presenting an unchecked green light.
Every action that touches evidence — viewing, exporting, sharing, holding, redacting, deleting — is written to an append-only audit log in which each entry is cryptographically chained to the one before it. Editing or removing a historical entry breaks the chain visibly. The log answers the courtroom questions directly: who accessed this footage, when, and what did they do.
Actions record the authenticated user who performed them. Body-worn footage is attributed to the wearer at shift check-in — recorded at the time, not reconstructed from a roster afterwards. Unattributed footage is honestly labeled as such.
Rejected uploads, failed integrity checks, and refused access attempts land in the same chain as successful ones. A record that only remembers what went right is not a chain of custody.
Evidence exports ship with a signed manifest: the file inventory, each file's SHA-256, and the custody records that produced it. Verification works offline — opposing counsel, an auditor, or a records officer can confirm the footage is bit-for-bit what the system captured using standard tooling, with no Nevtech software, account, or cooperation required.
A hold pins footage outside the normal retention clock. Held items cannot age out or be deleted while the hold stands, and the hold itself — who placed it, when, on what — is part of the audit chain.
Redaction produces a new derivative for disclosure; the original footage and its original hash remain intact and verifiable. A redacted copy can never silently replace the source.
When footage is deleted — by retention policy or by an authorized action — the deletion is recorded and certifiable: what existed, what its hash was, when and why it was removed. Absence of footage is itself documented.
Access rules are not interface decorations — they are enforced where the data lives, and every grant and refusal is auditable.
| Layer | Mechanism |
|---|---|
| Organizations | Full tenant isolation: one organization's cameras, footage, events, and users are invisible to every other organization by construction. |
| Users | Per-user camera scope — an operator sees exactly the cameras they are granted, in the list, the timeline, the alerts, and the exports alike. |
| Media plane | Zero-trust streaming: the media layer holds no user accounts; every single stream view is authorized by a short-lived, per-camera ticket issued by the platform. |
| Sessions | Server-side session control: instant revocation, sign-out-everywhere, and an automatic inactivity timeout — with every session start and end in the audit chain. |
| Devices | Body-worn and mobile cameras authenticate with per-device credentials that can be individually revoked without touching any other device. |
Live streams, uploads, and console traffic travel over TLS; site gateways connect through encrypted WireGuard tunnels; stored footage is encrypted at rest on Google Cloud storage; and camera credentials are stored encrypted, decrypted only at the moment of use.
Nevtech VMS is engineered around CJIS-aligned security practices — the access-control, audit, and integrity disciplines described above. We state that precisely: aligned, by design and verifiable in the product. The platform's claims do not rest on paperwork; every mechanism on this page can be exercised and checked on a live system during evaluation.
Deployed inside your own Google Cloud project, footage lives in storage buckets you own, in the region you choose, under your billing and your access policy. Residency and control requirements are satisfied by ownership, not by promises.
Retention windows are configured per organization, enforced automatically, and interact correctly with legal holds — held footage outlives its window; everything else ages out on schedule, with deletions recorded.
Every recorded segment gets a SHA-256 fingerprint when it is captured — on the device itself for body-worn footage recorded through a dropout — and the fingerprint is stored in the evidence manifest and carried into every export. Recompute the hash of the file you hold and compare: a match proves the bytes are identical to what was captured, and any alteration, however small, produces a visibly different hash.
Every action that touches evidence: views, exports, shares, legal holds, redactions, deletions, session starts and ends, and rejected or failed operations — each entry attributed to the authenticated user and cryptographically chained to the previous entry, so history cannot be edited without breaking the chain visibly.
Yes — that is the design goal. Exports ship with a signed manifest listing every file and its SHA-256, and verification runs offline with standard tools: no Nevtech software, no Nevtech account, no cooperation from us or from the organization that operated the cameras. The proof travels with the evidence.
The platform is engineered around CJIS-aligned security practices — auditability, access control, and integrity verification — and customer-owned Google Cloud deployment satisfies data-residency and control requirements by ownership. We publish the mechanisms rather than badges: everything on this page can be exercised and verified on a live system during your evaluation.
Deeper dives: Evidence Management · Security architecture
Book a demo and we'll export evidence from a live system in front of you — then verify it together, offline.
Book a demo