> Method for Medusa instruments: receipts before claims, hashed artefacts, four finished states. The family remains NOT YET PUBLISHED.

- Canonical: https://hadalinstruments.com/methodology/medusa/

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Method

# How a Medusa measurement is allowed to exist

The family declaration at [Medusa instruments](https://hadalinstruments.com/medusa/) stays **NOT YET PUBLISHED**. This page states the method that would bind a measurement if one were published — it does not publish one.

## Method before measurement

A Medusa run fixes its epoch and its rules before it judges. Nothing is reported as a measurement until the method that produced it can be named. A plausible number without that method is not a receipt.

## Artefacts are hashed

An observation that enters the store carries a content hash of its bytes. Marts are derived from those artefacts; an artefact is never invented from a mart. If the hash cannot be shown, the observation is not published as measured.

## Four finished states — and only four

When a stage or a run finishes, its state is one of `success`, `failure`, `could-not-run`, or `not-run`. The last two are states of the instrument or of the work that did not happen — they are not drawn as zero, and they are never rendered as a pass.

## Verified is a human act

Registry documents are fetched deterministically. Marking a rule `verified` after a document changes is a person reading the diff and accepting it. The fetch does not verify; the human does.

## What a model may and may not do

A model may feed an engine and may write a dossier from receipts. It does not fetch law, and it does not invent a rank. Judging steps stay deterministic engines; feed failure is itself a state on the run.

## Lane separation

Analyse does not execute; execute does not close the loop. Closing a loop requires its own receipt that the change was applied and observed — not a hope that the analysis was right.

## What this method does not establish

The Medusa method does not establish a ranking of firms or pages as a league table. It does not establish that traffic moved for a claimed reason. It does not establish that a citation in an answer engine is an endorsement. It does not establish that an applied change worked unless a closed-loop receipt says so. Those readings, however tempting, are outside the method.

Family declaration: [Medusa instruments](https://hadalinstruments.com/medusa/). Site methodology index: [Methodology](https://hadalinstruments.com/methodology/).

## Cite This Article

APA BibTeX HTML

Hadal Instruments. How a Medusa measurement is allowed to exist. Hadal Methodology. https://hadalinstruments.com/methodology/medusa/

@misc{hadal_preprint_medusa,
author = {Hadal Instruments},
title = {How a Medusa measurement is allowed to exist},
url = {https://hadalinstruments.com/methodology/medusa/},
howpublished = {Hadal Methodology},
note = {Pre-launch publication}
}

Source: Hadal Instruments, How a Medusa measurement is allowed to exist. <a href='https://hadalinstruments.com/methodology/medusa/' rel='canonical'>Original Research</a>

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