plumb-line-provenance (Python)

A conservative provenance / confidence / lineage envelope with a taint-propagation combination law: once any input is mock or low-confidence, every value derived from it inherits that taint automatically — there is no escape hatch that silently clears the flag.

from plumb_line_provenance import mark, derive, meta_of, audit_meta

base = mark(1000, source='real', confidence='high')
rate = mark(1.25, source='mock', confidence='low')
total = derive([base, rate], lambda a, r: a * r)

total['meta']['derived_from_mock']  # True  — inherited from rate, cannot be cleared
total['meta']['confidence']         # 'low' — only as certain as the weakest input
audit_meta(meta_of(total))          # []    — internally consistent

You can also copy the module files directly into a project and import them flat (from marked import mark); both styles work.

Specification: SPEC.md (envelope schema version 2)
Model, law, examples: README.md
License: Apache-2.0

JavaScript parity package: plumb-line-provenance on npm.

Development Status
- 4 - Beta
Intended Audience
- Developers
- Science/Research
Programming Language
- Python :: 3
Topic
- Software Development :: Quality Assurance

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Provenance

The following attestation bundles were made for plumb_line_provenance-0.7.0.tar.gz:

Publisher: release.yml on slopstopper/plumb-line

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: plumb_line_provenance-0.7.0.tar.gz
- Subject digest: e481e2fd95947cc66833b67212de3b3099ffc8cc11e1112ce1f0a5deda6d97db
- Sigstore transparency entry: 2146603250
- Sigstore integration time: Jul 11, 2026
Source repository:
- Permalink: slopstopper/plumb-line@c4132a060a20800a461b9502e09797c78e7d1cdc
- Branch / Tag: refs/tags/v0.7.0
- Owner: https://github.com/slopstopper
- Access: public
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- Runner Environment: github-hosted
- Publication workflow: release.yml@c4132a060a20800a461b9502e09797c78e7d1cdc
- Trigger Event: push