CrawlCheck

Timestamp proof

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

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 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

  1. 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.
  2. 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.
  3. 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.
  4. Anyone verifies it with the reference client and no permission from us: ots verify -d <root> crawlcheck-2026-09-08.ots

2026-09-08

Merkle rootba072323ee16a87bb0bc726675555583a606bdc16f3a0b9b0e560cb56ad31ad2
Reports covered113
Sealed2026-09-09T01:18:00.961Z
Bitcoin anchorsubmitted to https://a.pool.opentimestamps.org — download the .ots proof

Every sealed day

39 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 113 digests sealed under this root

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0702f4ca6cbee97e8cf7c37babc749fdf2d5945de14b6ec9bd0cfccc32ebf113
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0ac52b7b340f50f3497715448827d46b8329bdfb9c900be57f025cd168d82813
0b522316cda1a2cd1e37ab9af6a4b681f453d841b4fdf6bd413c4be163391141
0c1292e0677d72c28c216107ccd20cdaffb5bd8ce6b6d3dc5e50d62e129d5b53
0d04dce774f1bac53e74cb7d2545a32e421839c17ba25192c9d58b521f5e9c2e
0fa30ba7d762ce8317aee118f4d06e6ec4510ea262f459bcac49668c04dcba1e
101df8ac4201eca95a8715c51155924c73015a45f49ef234be2ecb6af1750c13
1163233f797aba87c5a4b6487779fc97b8d7becc7315ec4183b5357a544c78f3
14713617c29ba03524ebe65a9d0ec3ba2475a0df36cdeca3fe5b8debe26336f4
16dd0272320a9736cf4f79e9c9a2d98607f37854e5d55a5ba599925856520267
18121679d9e513c28819a4bad5a6002be15877a761176f5818b908502972e7d6
1c95dad8602271b0eaacdf2737c0bbd977cf75e1d57980377d8a7d45faba10eb
1cb2620d2db3c01154e759d244faa21c942fda94c9ba53165f4c6964052b9aeb
21022528cc76149d72749e28a82945c38db0d5777797b1681c3bd7196ecc0196
2257d1ba2bf3608d2e46dd64dc10659838d7858286a707829c61b504c8be3741
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284fb1cda6da12b0a84c86a6e1b624bf3192bcf0d591ea6fa28d64f093d5863a
28ae199e3cd146721548a6022952bedcf06eadfd9f06dfae1d3f931a807b116e
2992cc9362cb2e72950b9a09ef1564cbbbd78cd44408df36b0434a2f92170a57
2c665716884c2733f7750ec1ea41c539da869bd8709ccbd642e068e4c36ff1e6
2e71d3a0bdb3aa0b6351621ddc8321568ce1509b755e0f21b2af95215f5e0766
3324fe7adca5d1227ca74b771d9cdc393130fc6ec8a1fd1a595e97560becadcf
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3427fe1a1716558f23e8c71a75f2e21478d45c3d2c18b80786be0239e42f111a
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375ce5635aea1a819ed589a18990a25f577f68a47b3d38ba9b1ff867649fbc45
380eebb6e4aa6f16aabf952a947c1e4555c93a75f48329a02f8e4d42203f8822
388c218b74da8599b0685c4ebb5f56d67106a8df7e04256fdaec00d54e465df5
3e5516767008294ca9cc0fed0b8019449c5fcae1085e15e53686f28e5457e85c
40ef8cece824e5c3aa153c7a1f545894e3c3e18d58bc7545ca46965388d77b18
427960bcf2f41ecb7b6d19ed58e5888bbe3eb8ba326eb1d906bca6fc236c17f4
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6c51433da6afebca98beca856dfce647fd8ae892ce16555f40de2aedd12706cd
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