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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsShort answer: identify the exact archived URL and capture, preserve its CDX index record, hash the retrievable payload, and compare that hash with the archive’s recorded digest. Treat the timestamp as the archive’s recorded capture time—not independent proof that the bytes were created then. If available, inspect the WARC record and record the Memento-Datetime header as additional, corroborating evidence.
What you can prove—and what you cannot
An archive verification usually establishes two separate facts:
- Integrity relative to the archive: the bytes you retrieved match the digest recorded for that capture.
- Archive-recorded time: the archive says it captured the resource at a particular timestamp.
Those facts do not, by themselves, prove when the original publisher created the content, that the archive clock was independently attested, or that the replay is byte-for-byte identical to the live response. Archive processing can rewrite URLs or migrate formats, and a replay body can therefore differ from the original HTTP entity.
Use precise wording in a report: “The archive index records a capture at YYYYMMDDhhmmss GMT, and the retrieved payload matches the listed digest.” Do not write “the creation date is proven” unless you also have a separately verifiable timestamp or provenance chain.
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1. Pin down the exact capture
Start with the complete replay URL and the original URL. Record the archive institution, collection, and any identifier shown by the service. A calendar dot is not enough: Archive-It explains that its calendar can collapse captures taken within minutes, while the CDX index may contain several distinct records.
- Original URL, including path and query string
- Archive name and collection
- Replay URL copied verbatim
- Raw 14-digit capture timestamp
- Status code and MIME type
- Digest and digest algorithm, if shown
- Payload length
- WARC filename and byte offset, if supplied
Save the page or API response containing these fields as evidence. Do not silently normalize the URL, remove a query parameter, or substitute a nearby capture.
2. Read the CDX index record
CDX is the index format commonly used to describe web-archive captures. Archive-It documents fields including the original URL, timestamp, status, MIME type, digest, length, filename, and offset. The Library of Congress describes the CDX timestamp as the point at which the object was captured, measured in GMT.
Preserve both forms of the time:
- Keep the raw 14-digit value, such as
20260929143012. - Render it for people as
2026-09-29 14:30:12 GMT. - Label it explicitly as the archive’s recorded capture time.
Never convert the value to local time and discard GMT. A timezone mistake can make an otherwise accurate record appear to have been captured on a different date.
3. Verify the payload digest
A CDX digest is a fingerprint of the indexed payload. Archive-It describes its value as a Base32-encoded SHA-1 checksum; the Library of Congress also describes the digest as a fingerprint. A match demonstrates consistency between the bytes you hashed and the archive’s recorded fingerprint.
Obtain the right bytes
Prefer an endpoint or download that returns the captured object rather than a replay wrapper containing archive banners, rewritten markup, or navigation chrome. If the service only exposes replay, document that limitation: transformations can change the bytes and make a direct digest comparison invalid.
Hash locally
For a file named capture.bin, calculate SHA-1 with a platform utility:
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- Linux:
sha1sum capture.bin - macOS:
shasum -a 1 capture.bin - Windows PowerShell:
Get-FileHash .capture.bin -Algorithm SHA1
Compare the result using the archive’s representation. A hexadecimal SHA-1 string is not textually equal to a Base32 digest even when both represent the same 160-bit value, so decode or re-encode consistently before comparing. Record the exact file, retrieval URL, date of retrieval, algorithm, and representation used.
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Interpret the result
- Match: the retrieved bytes are consistent with the archive’s listed digest.
- Mismatch: you may have received a replay wrapper, a transformed representation, the wrong capture, an incomplete download, or a changed archive object. Recheck the URL, timestamp, redirects, content encoding, and retrieval method.
- No digest: report that the archive did not expose a digest; do not infer integrity from the timestamp alone.
4. Inspect WARC metadata when access is available
WARC files package captured web resources with metadata. Their records include fields such as date, type, and length. A CDX filename and offset can locate the corresponding record, allowing a second view of the target URL, timestamp, and payload.
WARC access is not always public. Archive-It says downloads of WARC storage and associated metadata are available to credentialed partners, so an ordinary visitor may be unable to obtain the record. If you can access it:
- Use the CDX filename and offset to locate the record.
- Confirm that the WARC target URL matches the original URL in the index.
- Compare the WARC date and record type with the CDX entry.
- Check the declared length against the bytes you retrieved.
- Preserve the record and its access conditions in your evidence package.
Agreement between CDX and WARC strengthens the claim that you identified the intended archive record. It remains evidence from the same archive, not an independent external timestamp authority.
5. Capture Memento protocol metadata
Memento is a standard method for negotiating prior states of a resource. When supported, record the Memento-Datetime response header and the original relation link. The header identifies the archival datetime associated with the Memento.
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6. Build an evidence record another person can reproduce
A defensible verification packet should contain:
- The complete original and replay URLs
- Archive, collection, and access date
- Raw timestamp and GMT rendering
- Status code, MIME type, length, and digest
- WARC filename and offset, when exposed
- The exact retrieval endpoint and whether it returned raw data or replay HTML
- Hash command, algorithm, encoding, and resulting value
Memento-Datetimeandoriginallink, when present- Any redirect, missing-resource, or replay warning
Then state the conclusion in two clauses: what the archive records, and what your byte-level check found. Keep those clauses separate from any claim about publication or creation by the original author.
Comparing several captures
When multiple records exist, compare them systematically rather than choosing the most convenient calendar entry.
| Axis | What to compare |
|---|---|
| Identity | Exact original URL, redirect target, status code, and MIME type |
| Time evidence | Raw archive timestamp, GMT basis, Memento-Datetime, and separate timestamp evidence |
| Integrity | Digest algorithm, digest value, bytes hashed, and match result |
| Record access | Whether WARC data and metadata are available for inspection |
| Completeness | Whether required resources were captured and whether the archive reports replay limitations |
A later capture may contain a newer page, while an earlier capture may lack images, scripts, or embedded media. Choose the record that answers your question and describe what is missing.
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Common failure modes and fixes
The calendar shows one capture, but CDX shows more
Use the CDX record’s exact timestamp. Calendar interfaces can group captures taken within minutes.
The hash does not match
Check whether you hashed archive navigation HTML instead of the captured object. Verify redirects, compression, content encoding, and whether the service transformed the replay. Download again and document the representation.
The requested date is absent
Archives may display the closest available capture rather than an exact-date capture. Report the actual timestamp and say that the requested date was not available.
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The page looks incomplete
Web archives cannot preserve every resource. The Library of Congress identifies limitations including streaming media, databases, deep-web content, and rich multimedia. Treat missing assets as a capture-completeness limitation, not evidence that the original page lacked them.
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Do not imply that you inspected a WARC record. Cite the CDX fields and replay evidence you actually obtained, and state that WARC access was unavailable.
A timestamp appears in a page’s visible text
That is publisher content, not necessarily archive metadata. Keep it separate from the CDX timestamp and explain which clock each value represents.
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FAQ
Does a matching SHA-1 prove who created a page?
No. It proves that the bytes you checked correspond to the archive’s listed fingerprint. Authorship and original publication time require separate evidence.
Should I convert every timestamp to my local timezone?
You may show a local rendering for convenience, but always preserve the raw timestamp and its documented GMT basis.
Is an archived replay a complete copy of the live website?
Not necessarily. Missing media, databases, deep-web content, scripts, or streaming resources can make a replay incomplete.
Frequently Asked Questions
Does a matching SHA-1 prove who created a page?
No. It verifies consistency with the archive’s recorded fingerprint, not authorship or original publication time.
Should I convert every timestamp to my local timezone?
Keep the raw timestamp and GMT basis; a local rendering is optional.
Is an archived replay a complete copy of the live website?
Not necessarily; archives report limitations for several kinds of media and dynamic content.
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