@uvrn/measure

@uvrn/measure

Pluggable relationship measurements for UVRN evidence. This package implements the first-party agree, disagree, conflict, and potential modules over the Measurement contract exported by @uvrn/core.

Package provides: first-party measurement objects, MeasurementRegistry, defaultRegistry, and convenience re-exports of the core measurement types. Pure logic only: no storage, signer, network call, or provider default.

You provide: a claim, evidence sources, and optional measurement context such as thresholds or agreement history.

Install

npm install @uvrn/measure @uvrn/core

Or with pnpm:

pnpm add @uvrn/measure @uvrn/core

Measurements

• Agree: emits agree when comparable sources converge at or above context.agreeThreshold (default 0.9), otherwise no-agreement. Fewer than two comparable sources emits insufficient-data.
• Disagree: emits disagree when numeric spread exceeds context.divergenceThreshold (default 0.1), otherwise none. Pure numeric spread is never conflict. Fewer than two numeric values emits insufficient-data.
• Conflict: emits conflict when two sources on the same field assert mutually exclusive categorical/boolean values or ranges separated by more than context.conflictRangeTolerance (default 0), otherwise none. Fewer than two categorical, boolean, or range assertions emits insufficient-data.
• Potential: emits potential when at least context.minObservations (default 3) agreement observations are rising over the last context.windowSize (default 3) points but still below the agree threshold. Confidence is scaled by sample size and trend strength; thin history or a signal below context.confidenceFloor (default 0.25) emits insufficient-data so weak early signals are never overstated.

Every measurement emits insufficient-data per SPEC/uvrn-measurement-v1.md §4 when it cannot measure, with an explanation stating what was missing. UIs should render it as "Not enough evidence", never as agreement or as an error.

Context keys

Key	Default	Used by
agreeThreshold	0.9	agree, potential
divergenceThreshold	0.1	disagree
conflictRangeTolerance	0	conflict
minObservations	3	potential
windowSize	3	potential
history / agreementHistory	—	potential (scores 0..1, oldest first)
confidenceFloor	0.25	potential

Usage

import { defaultRegistry } from '@uvrn/measure';

const registry = defaultRegistry();

const results = registry.runAll({
  claim: 'Two sources report similar revenue.',
  sources: [
    { id: 'source-a', kind: 'numeric', value: 100, label: 'Source A' },
    { id: 'source-b', kind: 'numeric', value: 104, label: 'Source B' },
  ],
  context: {
    agreeThreshold: 0.9,
    divergenceThreshold: 0.1,
    history: [0.55, 0.62, 0.74],
  },
});

Custom measurements

Core owns the interface; this package owns starter implementations. A host can add or replace measurement logic by implementing Measurement and registering it.

import { Measurement, MeasurementRegistry } from '@uvrn/measure';

const customMeasurement: Measurement = {
  type: 'custom',
  evaluate(input) {
    return {
      type: 'custom',
      verdict: input.sources.length > 0 ? 'observed' : 'none',
      confidence: input.sources.length > 0 ? 1 : 0,
      explanation: 'Custom measurement checked whether any evidence was present.',
      evidenceRefs: input.sources.map((source) => source.id),
    };
  },
};

const registry = new MeasurementRegistry();
registry.register(customMeasurement);

Package Boundary

@uvrn/measure depends only on the shared measurement contract from @uvrn/core. Hosts can adapt consensus, compare, drift, or other package outputs into measurement input before calling this package, but v1 ships no adapter-backed peer surface.

Links

Source code and issues: GitHub (uvrn-packages). Project landing: UVRN.