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-2026-08-18.ots

2026-08-18

Merkle rootdc1802f20c42c78861d2258a85b573a99d2e4b5028a59b412565d55acf9b7944
Reports covered121
Sealed2026-08-19T01:17:54.881Z
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 121 digests sealed under this root

01bda1c235ef95f1599eed35324cada58eeed5ae8b21f572b65ccd58e94e2973
03272bdb8e3ac5940714b961a206a54ac9c429f6bac83b3fc2cd6a7e0b840588
077011e50f1ac2e2feb037968b272db263ca95738a1de7a0d3194e9412f765f8
089eb3d577fa151e2413a40b7149f2dea10c89838668ba03e310fb36bfdc452b
0d7b418c0cbd71af00605b8d0867722e6ab250ee947bbbf2f6d0fa2db807277c
0e02e4fbcb3582910d6453a2f6458a9ea4bf1adfaa93e9c43c0f25b5c74ed722
0f18d1b992279f3512567a06cef56e11b3b19933d06d228d2086f9b86768b190
11c990c4391e50b3fedee6dd8a50863437ffc772b2318645dfd44179d821b76f
11cc46b65a60132abee38127f2ddf1fd59a38748dca17f7aa2c7d364d2de1de0
15c30c334c679fff851c6635303b5b75393b8adf3c7d18ce0e476a696335d765
1836539ed6e260dd9295ada10cef3cce4e8a9a6692f301b8b46bbfebe7ec53a0
18f83f38e368ff4a959ffa24db7afeec86759e7853ef3d58a551ed9207006280
19031a0752816b59479af1fa284d7b21821b321fbe01604a0e3804393e782639
1a2581a0d0e195ff492f16d761151110a803d3abf4a0a570d70061ba87a152d7
1a75f027bdf1165f4c2a974f5fbd4a97c00f73f13adc97d5fdf3a0476a570bc4
207e0129037c94b05d7ad4c0a745439557dae227e55d0110760d933f4a9ad9a4
235c94d8f1b4ff922ad3bef5dabf559880248a1ad99e5858eda4174e319e3732
2746ec2b269d34eabc5d01b8cd985a489ff6180993c2b1d59e7df5afdc1751d6
282a013f7580cc6d6d8b2f8d2ed45ee565732e3932996092adee474b86b78534
2a04ef0ce4bfae0cbe40e2570be749593ed8717189bca69a43eff8068ff73ae6
2dd62cc5365f2c5063e0cd1284e37f945f72292b748d5a7eac7a8be87b0ba824
2f9a275ab953da3972609d891bfd874e424ba074937cbb0a00fc901ec33c6037
30559753c21b22cb0931fd688d12bc6c09c78ed544f926b0a06cde552957bc82
325f0159bc0e8df042779ff46cc93d48f52222c483b84315e927e1d3e137e719
33fda465b090a06334a557b38ff92d1c737a6562593c1265e6e847aa98d393ba
35b3816897def6aac8a4537c8c6e48b4ed99c7e1653938c19ac0f2b9e199f95e
36363ea8ee7ba409f818043637a86ddd3ae128e9357d5e93e1b942d72d3cd74b
366f6d2e07757334c209de0e6ca7073a0f5fc1d2c624c6132e4367d8ca62e151
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3a62572e688fa5ef5cab2f5955ac73d0f584b8d7389a703ebc824064cf8f2a70
3cceb8a82b6c3015702e6b34103bc968e662872610d5dd5c714fdb116e198802
423557c5c4bbf007cb5a603f3cfa508e172632bab71e9f36e7c1590d9c7689ae
47033540a5f14853f12a74adc86fddb42650d4583d0b77e2ba43b4625e27b275
4771c66ef706a0658d1c4c9aa4725620bf54ed4c7ad012c0d4525a30a813cf3b
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7e6c4c046deb29b32d420d9d097ce7d56196bbee934aa24217c856d94d73cd1f
8129572935daa9f37572a048817bca0f42275297c3267c362eaef5948e7192f6
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