worked example of the 12 month rule
Preserved versions
| Version | Captured | Reason | Type | Extraction | SHA-256 |
|---|---|---|---|---|---|
| 1 | first capture | application/pdf 99.1 KB | ok:pdf | 5ff5eedbb863206c036c8fbb0a86698d0960a81c8b90e51cce5a57cc7dbe73a3 |
Each version is an immutable copy; the SHA-256 identifies the exact bytes captured. A new version is recorded only when the content genuinely changes. The original is always at the official URL above.