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-2026-08-21.ots

2026-08-21

Merkle rootcd468f5937873fe4ce8e7fa0a19f97ef841eff4762b9e5b90b19fc7e90e63473
Reports covered78
Sealed2026-08-22T01:17:41.734Z
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 78 digests sealed under this root
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2f7885bc206ef52d8ffe7fc6fbe02ca8f82e5b7641e2e837cc9b2c501088c71c
32a6e6a7f4c6e7da0ffe63686b5489b1704679f4afa4bf14455110b6fbaa62aa
32e2af3dba5cd2d6bdae2d00817ef7bf38c92f0c619938adf70af73d5ea2ab2a
356c516ad4daaa4697cbcba40decf309485c8be8a6e1ba31c06812039ffe6f8f
3dbb6b92dd880680ce52958bbd7dd74e0fae230a5106c4ca8034fafed638f022
4662f8e28bcb1d06f330aafb6efa40fbe0ec3d2cf9e1731ab7832e2be169f4ab
4cd82fb19fb52a520c44dae6f4efb68cc548fbf285751f7ca319a4040b27e09d
51a200fac7f4a39ba9a102e628fb0194c9fdd969de8979831c69c2d30e035bfa
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5ad6e30e52cff5f51c9bc7ceb84eb7d64b484aea6627dcb285f7df025a14c22c
5da45cb7273a0e17d135aca7df196ed0527cdfe5865ace6d8b622c459d2fdffb
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