Timestamp proof

Every report is fingerprinted, and each day is anchored to Bitcoin

In one sentence

Every CrawlCheck report is reduced to its measurements — host, timestamp, section scores, every path and status fetched, every crawler identity and what it received, the citation state — canonicalised and hashed with SHA-256, and each day’s digests are anchored to the Bitcoin blockchain with OpenTimestamps. That proves a report existed in exactly that form at that time and has not been altered since; it does not prove the measurement was correct, and this page says which claim is which.

A report is a claim about what a server did at a moment in time. Until it is anchored, the only evidence that it said so — and that nobody edited it afterwards — is our own database, which we control.

The chain, the last 7 sealed days

1,318 report fingerprints in these 7 roots, 6 of them already in Bitcoin. Click a day for its root and its .ots file.

The citation state is inside this digest too. The names, the phone numbers, the address, and every profile the site claims — with what each one answered when it was checked — are part of the fingerprint. It does not mean a directory indexed anything: no timestamp can do that. It means the state of those listings on that date can be proved rather than remembered.

What this proves: that a report existed in exactly this form at that time, and has not been altered since. What it does not prove: that the measurement was correct. Those are two different claims and only the first can be settled by mathematics.

How it works

Each report is reduced to its measurements — host, timestamp, section scores, every path and status fetched, every crawler identity and what it received — canonicalised with sorted keys and hashed with SHA-256. Wording, layout and section copy are excluded, so an editorial change never invalidates an existing proof.
The day’s digests are sorted and folded into a Merkle tree: parent = SHA256(left || right), an odd node paired with itself. Sorting means the order scans arrived cannot change the root.
The root is submitted to the OpenTimestamps calendars, which aggregate it into a Bitcoin transaction. No wallet, no fee, no key held by us — the proof is a file, not a coin.
Anyone verifies it with the reference client and no permission from us: ots verify -d <root> crawlcheck-2026-09-27.ots

2026-09-27

Merkle root	`00ac098c43566faef8f0302da80ed611645fdb9fdd1c94ef6be795fb9695748a`
Reports covered	208
Sealed	2026-09-28T01:17:40.258Z
Bitcoin anchor	submitted to `https://a.pool.opentimestamps.org` — download the .ots proof

Every sealed day

46 days anchored. Each links to its own root and proof file.

A fresh submission reports pending confirmation until the calendar’s next Bitcoin transaction confirms, usually within a few hours. Run ots upgrade on the file after that and it carries a block header attestation permanently.

The 208 digests sealed under this root

006551051e25db86392a1ece3a023844917d7c334deb069ea5e638e5b0afeaed
02915a512c5f0f08532d25badb9c4d5e7e027756045c0939552952c8987ed197
047d254e624be0009abc4628866ee3f4e7bd88a172c472c53199bbe828f042f3
067c029a70c71c290f26ffa12d32a515ab95f41ea19270a64f0596d2c7d3e1ac
0886f76ba727ce8af33bd33bf74ea0d669ff1bf8e3cf0c4b34c19fc59b709106
092aaff4e4090ce532bb95a10be117cb8a26715ee7aa0b1cb693e7b5231cb5ed
0bafb35c5388f22100f0440d734f02b06bffa9b4cc1f64976e37edf7ea8426f0
0c9f8733701f4ebf7ccb24d371079330d7c127a2d8c126adb760eb6ef5b4301f
0f9e302674f6ec7f7bf9147d38482d8c36d97052af0242549a2cf9fc82b0ecbf
117d2b7f812866b43fd1a38bf4dde156827be1afcd8bd3f6c4a665875eb7587a
12158551a57c330e5937dd5b14ddb00ed167ba5e2f3417d1f26c2d64442773df
141e70911e9d98bafd8e7add60855c5de8c0a702a84136d0e5f57c3188258d90
18cb43582d59a984fcc6eb158a6cc1eb49d0d396b6cac883565732af15b5caa4
191ad79e59f3c84bf65163e7b0919873f561d54c344d6d484ad815320ce019b1
1b08697e6b59586cebcbf97a539fbeed10f3f1ec2fb426fe0b5d3664282d84aa
1c27462f907f61797f5301e54878cbee29d3f2c02a6677ce230fefe1cfab3cd3
1ccd438a40ddd48c8c046b205aa0e526a19f81f7c9f4c77b11e663dd527105ca
1d4d9755e4f09e759fdf1be17d2077af651aeab2a03028532288c710051b8e12
1d625f0c3fa8df81f4de04a644f13e13e12c2870fbead7680955fb8bd6d708e1
1f20d48c0d02206b2ed9104fdb0b232c27dc4f455e3489452d4853189bab8e43
1f373f910ea8152f0c25f3d1671c2476c64736a2b41059f4f1ddb11d204718a7
212e6c1651066c48f9e47d270761bad02bcec9281f27f8ff22095b22e19ef5df
21cf43c97d4b547e1e92342b92f269fbed0bd0f5b521db1ce76543a9ee94e43b
2217b4f4df78bde67b1cd57ce36475e4281348eade73dddd678800ec78c5d259
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Questions about this page

QWhat does the Bitcoin anchor prove?

That a report with exactly this digest existed no later than the anchored block, and that it has not been edited since. It is a proof about time and integrity, not about correctness.

QHow do I verify a report myself?

Download the day’s .ots proof from this page, recompute the report digest from its JSON record, and verify the proof with the OpenTimestamps client against a Bitcoin node or public calendar. No CrawlCheck server is needed for the check.

QWhy exclude wording and layout from the hash?

So an editorial change never invalidates a measurement. Only the measured fields are hashed; the words around them can be improved without the proof breaking.

QWhich days are anchored?

Every sealed day is listed on this page with its digest and proof file. Days are sealed once, after they end, and never recomputed. A day sealed within the last day or so reads as pending in the reference client: the calendar holds the commitment, and the Bitcoin block confirming it is usually mined within 24 hours. The proof file here is upgraded to carry that block header once it exists, so a pending file is a proof waiting on a block, not a missing seal.

Keep reading

The dataset these fingerprints coverEvery anchored day is a day of these measurements.What is collected, and how to opt outOne line in robots.txt keeps a domain out of the dataset entirely.Change receipts and the recordThe artifact a third party can verify — what a licence actually buys.