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An attested record of GPU power actions

Spark-XC keeps an attested, tamper-evident record of GPU power-cap changes, whoever makes them. GPU fleets change power limits for cost, capacity, and grid curtailment, and each change can be checked after the fact.

SPARK-XC sits alongside the GPU management interface, scheduler, and facility stack, and records power-limit changes made by other tools, not just its own. Each recorded change is written as a Power Event Record with the GPU's reported limit before and after, signed with Ed25519 and hash-chained, so an edit to a stored record breaks the chain on recompute.

Ed25519-signed records Power Event Record SHA-256 hash chain
Investment Thesis at a Glance
Why now
GPU fleets are growing, and their power limits get changed for cost, capacity, and grid curtailment. Each change is an action someone may later need to check.
Product: the Power Event Record
Each recorded GPU power action becomes a Power Event Record: the limit requested, the limit set, and the limit the GPU reported back, hash-chained so a later edit shows up on recompute.
Multiple buyer profiles
Data center operators, energy and facility teams, grid and interconnection leads, finance, and audit and compliance teams: anyone who needs to check what happened to GPU power, and when.
Infrastructure layer positioning
The record sits alongside the GPU, scheduler, and facility stack as a separate layer that keeps its own evidence.
The Architecture Advantage

Why an attested, hash-chained record matters competitively

Architecture
Each recorded change becomes a tamper-evident Power Event Record. Records are hash-chained, so an edit to a stored record breaks the chain on recompute.
Position in the stack
It sits alongside the GPU management interface, scheduler, and facility tools rather than competing with them. Anyone with a copy of the records can re-verify the chain.
Verifiable Properties
Each record carries evidence that can be checked: post-action power-limit readback, GPU telemetry, and SHA-256 hash-chain integrity. Every record is signed with Ed25519. Auditors only need the public key.
Why it matters
When a GPU power or curtailment action is questioned later, by finance, an auditor, or a grid operator, a tamper-evident record of what was requested, set, and read back gives the operator something concrete to show, not just an assertion.
A Tamper-Evident Evidence Chain as Infrastructure
The evidence chain adds a tamper-evident Power Event Record for each recorded power action: an edit to a stored record breaks the hash chain on recompute. The record becomes more useful as it grows.
Strategic value
Over time, an operator builds up a hash-chained history of its GPU power actions: a resource for audits, incident review, and analysis.
Readback, Not Just Logs
Each record includes the power limit that was requested, the limit that was set, and the limit the GPU itself reported back through its management interface.
Checkable later
Anyone with a copy can re-verify the chain. Rewrites become detectable once anchors sit somewhere the operator can't change: anchors go to a local write-once directory by default, and can be sent to off-site storage you control.
Market Context

What is changing

AI Infrastructure Growth
Cloud providers, AI labs, and enterprises keep adding GPU capacity. Each GPU added is another device whose power actions may need to be explained later.
Market Driver
Grid Curtailment
Grid operators are paying closer attention to large data-center loads and how they flex. When a site curtails GPU power, an attested record shows what was set, when, and what the GPU read back.
Grid Driver
Scattered Records
Power-limit changes can end up spread across scheduler, driver, and facility logs. SPARK-XC puts each recorded action into one hash-chained Power Event Record.
Operator Driver
Team

Founder-led, operator-built

SPARK-XC is founder-led and built from hands-on experience in GPU infrastructure operations, systems engineering, and hardware safety.

Steven O'Neill
Founder & CEO
Background in GPU infrastructure operations, systems engineering, and hardware safety. Designed and leads development of Spark-XC.
Growing Team
Engineering & Go-to-Market
We are actively building our engineering and go-to-market teams. Reach out if you're interested in joining.
Built to be checked

What a record lets anyone check

Per change
One signed record · SHA-256 hash chain
Public key
All an auditor needs to check it
Why Now

Why an attested power record matters now

GPU fleets are growing, and their power limits change for cost, capacity, and grid curtailment. Each change is an action that finance teams, auditors, or grid operators may later ask about.

SPARK-XC keeps an attested, tamper-evident record of those changes, so an operator can show what was requested, what was set, and what the GPU reported back.

When someone asks what your GPUs did, you hand them the records and the public key. They can check the signatures and the chain themselves, without access to your systems.

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