# Left-censored date

In the Stablecoin Scanner's method: the date its observed history starts; silence before it proves nothing.

Canonical: https://achivx.org/glossary/left-censored-date/
Updated: 2026-11-01

In the Stablecoin Scanner's methodology, the left-censored date is the date from which the scanner's observed history starts: everything earlier is invisible to it, so the absence of a signal before that date means nothing. 'Left-censored' is the statistician's word for a record cut off on the left. The scanner says it is not the same as the 'since' date on an address's volume line, which can be earlier.

## What the sources say

| Source | Quote | Link |
|---|---|---|
| ACHIVX Academy glossary: left-censored | "seen only from a starting date: everything before it is invisible, so an absence of signal there means nothing." | [achivx.com](https://achivx.com/academy/reference/glossary.html) |
| ACHIVX Academy glossary: not the 'since' date | "Not the since date on an address’s volume line, which is that address’s oldest day in the settlement record and can be earlier." | [achivx.com](https://achivx.com/academy/reference/glossary.html) |
| ACHIVX Academy: the statistician's word | "The scanner’s history begins at a date, and everything earlier is invisible — left-censored, the statistician’s word for a record cut off on the left." | [achivx.com](https://achivx.com/academy/how-it-works/what-left-censored-means.html) |

## Related terms

- [Coverage and freshness](/glossary/coverage-and-freshness/)
- [Risk tier](/glossary/risk-tier/)
- [Sanctions exposure](/glossary/sanctions-exposure/)

## See also

- Explainer: [What do “observed history starts” and “left-censored” mean?](https://achivx.com/academy/how-it-works/what-left-censored-means.html)

Checked against the sources on 2026-11-01.

## Sources
- https://achivx.com/academy/reference/glossary.html
- https://achivx.com/academy/how-it-works/what-left-censored-means.html