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

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-2026-08-27.ots

2026-08-27

Merkle root	`e2afa29ceacc0bbff3f715e9834d27f0fddc640bce0cbb843a12d4e3ecb4cf09`
Reports covered	131
Sealed	2026-08-28T01:17:20.411Z
Bitcoin anchor	submitted 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.

2026-09-20 · .ots
2026-09-19 · .ots
2026-09-18 · .ots
2026-09-17 · .ots
2026-09-16 · .ots
2026-09-15 · .ots
2026-09-14 · .ots
2026-09-13 · .ots
2026-09-12 · .ots
2026-09-11 · .ots
2026-09-10 · .ots
2026-09-09 · .ots
2026-09-08 · .ots
2026-09-07 · .ots
2026-09-06 · .ots
2026-09-05 · .ots
2026-09-04 · .ots
2026-09-03 · .ots
2026-09-02 · .ots
2026-09-01 · .ots
2026-08-31 · .ots
2026-08-30 · .ots
2026-08-29 · .ots
2026-08-28 · .ots
2026-08-27 · .ots
2026-08-26 · .ots
2026-08-25 · .ots
2026-08-24 · .ots
2026-08-23 · .ots
2026-08-22 · .ots
2026-08-21 · .ots
2026-08-20 · .ots
2026-08-19 · .ots
2026-08-18 · .ots
2026-08-17 · .ots
2026-08-16 · .ots
2026-08-15 · .ots
2026-08-14 · .ots
2026-08-13 · .ots

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 131 digests sealed under this root

0084e934667be31c5e4d00019a37c1c5886dd3922cfb89bab67f889e76cfc801
046272b9cafca69140bde4235407f40bb66f050e06b58d1b1adbd9fcc71625a8
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0a03d887630fd45b42a183106e6c7ff6323ba2d9bbf8f7a6adf71dd6cb7ff176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2e35a1381a929bf59760992335f536fe1537437b0a635245ba790083ede6bf18
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