About

AsOf is a temporal fact ledger.

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 daily read on what changed in tech and AI, why it matters and what to watch, with a recap of the week every Sunday, kept separate from the record.

Facts

name: AsOf
canonical: https://asof.is
description: AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.
founded: 2026
unit: claim (subject, predicate, value, valid_from, valid_to, sources, confidence)
identifier: ent_ and the entity's slug (ent_google), resolving at https://asof.is/record/{slug}; cite the URL in schema.org sameAs beside the Wikidata QID (/identifiers)
rule: nothing overwritten. Superseded claims get an end date and a pointer.
surfaces: web pages with markdown twins, REST API, MCP server, open snapshots (planned), 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

Only checked claims are published. A claim is checked when its value is the source's own data, parsed (SEC filings, the Hugging Face API, official status dashboards, a publisher's own feed), or when one of its own source pages, read, states its value and its date, in a passage the claim page quotes. Claims not yet checked are held, not shown; the record would rather say less than say something it has not checked.
Two independent sources: published with status valid (corroborated, not a guarantee of accuracy).
One source: published as unverified and labeled so.
Sources disagree: both claims stored and flagged. Nothing resolved silently.
Two tiers of display among checked claims. Answer surfaces (the facts under an entity name, the state table, the home page, structured data, the MCP default, llms-full.txt, the Brief) show only what the record asserts: valid claims, or a primary source at confidence 0.7 or more. The rest stays on the record, labelled, in timelines, twins and changelogs.
Primary regulatory filings (SEC EDGAR) and official status dashboards publish with status 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 below are queued for human review; we aim to review them on the next scheduled run.

Statuses

valid: Two independent sources agree, or a primary source states it: the record asserts this claim.: Two independent sources agree, or a primary source states it: the record asserts this claim.
unverified: One source so far: shown on the record, not asserted, until a second source or a primary one confirms it.: One source so far: shown on the record, not asserted, until a second source or a primary one confirms it.
disputed: Sources disagree: both claims stay on the record, flagged, until a source settles it.: Sources disagree: both claims stay on the record, flagged, until a source settles it.
superseded: A later claim replaced it: it keeps its end date and a pointer to the claim that replaced it, and is never deleted.: A later claim replaced it: it keeps its end date and a pointer to the claim that replaced it, and is never deleted.

Glossary

asserted: The record stands behind this value for the day asked: two independent sources agree, or a primary source states it (alone, at confidence 0.7 or more). Everything else stays on the record, labelled.
held, not asserted: On the record but not the answer: one source without a primary, sources that disagree, confidence below the line, or a value marked for review. Kept and labelled until a source settles it.
confidence: How well the sources support the value, from 0 to 1. A single primary source is asserted from 0.7; nothing below 0.5 is asserted; a dead or disagreeing source lowers it.
valid from: The day the value took effect, not the day it was published. A period figure (a year's revenue) is dated at the period's end.
undated: The source gives no date, so the record shows none rather than invent one. An undated claim is never the answer for a date.
sources: Primary: the entity's own filing, feed or site. Secondary: a publisher reporting it. Each claim links every source it has, with the passage that states the value where one was read.

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Read on: every fact across the record · what changed, by day · the API · snapshots and integrity