Voltry Probe

Voltry Probe is an open, read-only agent that produces a signed condition and provenance record for data-center GPUs. It reads what the hardware already exposes over NVML and the NVIDIA attestation chain (with DCGM and Redfish telemetry consumed where a collector provides it), binds the readings to the device's fused cryptographic identity, and renders a self-contained certificate you can open with no network at all.

It never states or implies what your hardware is worth. It records what the hardware is.

Install

pipx install voltry-probe

Requires Python 3.10 or newer. Stock DGX OS and Ubuntu 22.04 hosts work as-is. pip install voltry-probe inside a virtualenv works too.

Optional extras:

pipx install "voltry-probe[hardware]"   # live NVML + Redfish readers
pipx install "voltry-probe[submit]"     # the opt-in submission client

Without [hardware] the probe runs against captured fixtures and simulators, which is all you need to evaluate it.

Sixty seconds to a certificate

# 1. Scan. Read-only, works fully offline and air-gapped.
#    Reads live hardware; signs with your operator key.
voltry scan --signing-key operator.pem --out bundle.json

# 2. Render. A self-contained HTML certificate, no network needed to view.
voltry cert bundle.json --out cert.html

Just evaluating, with no GPU and no key of your own? Point scan at a captured sample and sign with a throwaway key:

voltry scan --fixture sample.json --ephemeral-key --out bundle.json
voltry cert bundle.json --out cert.html

That is the whole loop. voltry submit exists as a separate, explicit, opt-in step; scanning and rendering never phone home.

What read-only means

The probe never writes to, resets, reconfigures, or stress-tests a device during a scan. You can run it on a live production fleet. Functional qualification (which does exercise the device) is a separate mode behind an explicit flag, never part of a read-only scan.

What the certificate says, and what it does not

The certificate keeps measured facts and modeled estimates in separate blocks that never look alike:

• Deterministic gates: authenticity, firmware integrity, functional and sanitization results. Pass or fail, no model in the loop.
• Measured condition: ECC and Xid history, retired and remapped pages, spare rows remaining, throttle and clock behavior. Raw values against published thresholds.
• Provenance: certification history on the device's permanent identity, append-only. A failed attempt stays on the record; cherry-picking is structurally impossible.

It never contains a price, a dollar figure, or a lifetime guarantee. Power-chain exposure reads "Not Assessed" unless the facility itself was instrumented; it is never inferred from board power.

Verifying a bundle yourself

Every bundle is signed (ECDSA P-384 over RFC 8785 canonical JSON) and can be verified by anyone with the voltry-evidence-schema package:

import json
from evidence_schema import EvidenceBundle, verify_bundle

bundle = EvidenceBundle.model_validate(json.load(open("bundle.json")))
assert verify_bundle(bundle)

License

Apache-2.0.