# About AsOf

AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.

Each entry is one claim: a subject, a fact, the dates it held, the sources that back it and a confidence score. When a fact changes, the old claim is closed and linked to the new one. The record is neutral and open. The Brief is a weekday read on what changed in tech and AI, why it matters and what to watch, kept separate from the record.

## Facts

name: AsOf  
canonical: https://asof.is  
founded: 2026  
unit: claim (subject, predicate, value, valid_from, valid_to, sources, confidence)  
rule: nothing overwritten. Superseded claims get an end date and a pointer.  
surfaces: web pages with markdown twins, REST API, MCP server, open snapshots, The Brief  
coverage: search and AI first; tech, public companies, general to follow  
license: claims are facts; descriptive text CC BY 4.0; Wikipedia-derived text CC BY-SA  

## How claims are verified

- Two independent sources: published as valid.
- One source: published as unverified and labeled so.
- Sources disagree: both claims stored and flagged. Nothing resolved silently.
- Two tiers of display. Answer surfaces (key facts, state table, home page, structured data, MCP default, llms-full.txt, the Brief) show only what the record asserts: valid, or primary-sourced at confidence 0.7+. Everything else stays on the record, labelled, in timelines, twins and changelogs.
- Primary regulatory filings (SEC EDGAR) and official status dashboards publish as valid.
- A statement whose source gives no date is shown as undated, never with an invented date.
- Core facts (leadership, ownership, founding, headquarters, financials, names) are re-checked against Wikidata and their own source links on a schedule; a dead or disagreeing source lowers confidence and marks the claim for review.
- Corrections submitted through /v1/corrections are listed for human review on the next scheduled run.

## Corrections

POST /v1/corrections with { claim_id?, message, source_url? }. Corrections with a primary source go to the review queue first.