Truth is not a single value; it is a value at a time. When finance restates a quarter or a customer corrects their address, the old answer does not stop being the answer that was reported then. Versioned Truth keeps both, with validity dates or a version number.

That makes audits answerable and year-old reports reproducible. It also takes discipline: immutable history, clear rules for corrections and queries that say which version they mean. Start simple, and never overwrite what you might be asked about later.