proof-citations 1.33.2

Fetch URLs and verify that quoted text appears on the page. Extracted from proof-engine.

proof-citations

Fetch URLs and verify that quoted text appears on the page — the citation-verification primitive extracted from Proof Engine.

Install

pip install proof-citations

Library

from proof_citations import verify_citation

result = verify_citation(
    "https://example.com/article",
    "the exact quoted sentence",
    "B1",                 # fact_id — used in messages
)
print(result["status"])   # "verified" | "partial" | "not_found" | "fetch_failed"
print(result["credibility"]["tier"])

CLI

proof-citations verify --url URL --quote "QUOTE TEXT" --fact-id B1
proof-citations verify --facts facts.json

Why

LLMs hallucinate citations. This package does one job: fetch the URL, normalize unicode and HTML, and confirm the quoted text is actually on the page. It handles PDFs, Wayback fallback, and the unicode quirks (en-dash vs hyphen, curly quotes, non-breaking spaces, HTML-entity-encoded quotes) that real citations contain.