> ## Documentation Index
> Fetch the complete documentation index at: https://doc.blankstate.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# The SGM

> The sensor engine beneath every World. Deterministic, universal, traceable, sub-millisecond.

The **Spectral Geometric Manifold (SGM)** is the sensor engine underneath every World. A single self-supervised instrument that reads the structure of an interaction (not what was said, but how it unfolded) across the same measurement space, in milliseconds, without retraining for each domain.

## What it reads

Any World produces an interaction: text, transcript, audio, video, environment. All of them enter the same instrument and produce the same class of reading: a spectral projection, a fidelity index, and traceable evidence segments.

The reading resolves along three axes:

| Axis               | What it reads                     |
| ------------------ | --------------------------------- |
| **C: Cognitive**   | How reasoning unfolds             |
| **B: Behavioural** | How someone acts under pressure   |
| **I: Intentional** | Whether intent aligns with action |

<Frame caption="The SGM. One instrument. Same geometry.">
  <img src="https://mintcdn.com/blankstate/_qJUwEIy0R37Mjeb/images/site/sgm-og.png?fit=max&auto=format&n=_qJUwEIy0R37Mjeb&q=85&s=eb317426c8f12f905d2c3c5bc9ee48d7" alt="Spectral Geometric Manifold" width="1200" height="630" data-path="images/site/sgm-og.png" />
</Frame>

The same instrument reads a pension advisor in London and a market trader in São Paulo, a human and an agent, a boardroom and a market stall.

## Four properties

**Deterministic.** Same input plus same Protocol equals the same output, bit-identical, across any deployment. This is a mathematical property of the spectral transform, not an approximation. It is the precondition for regulatory admissibility.

**Universal.** The same measurement space holds across domains, languages, modalities, and participants. Human and machine judgment become directly comparable inside a single reference.

**Traceable.** Every reading reconstructs to the specific segments of the interaction that produced it. The evidence ships with the score.

**Sub-millisecond.** Complexity scales linearly. Population-scale throughput without GPUs at read time.

## Provenance

Four years of research proved the physics. Eighteen months of empirical validation across regulated institutions confirmed the instrument in production. Paper 0 (Self-Supervised Meta-Heuristic Mapping) is published and cited in the physical edition of *The Oxford Handbook of the Foundations and Regulation of Generative AI* (2025).

Empirical properties: reported on the public surface at [blankstate.ai/sgm](https://blankstate.ai/sgm).

## Current version

SGM 0.2 is in production. API URL: `https://ibf.blankstate.ai/api/v1/`. The version is pinned on the Protocol, not on the URL.