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-2026-08-13.ots
2026-08-13
| Merkle root | 70bdfd2db54d008476fcbbb59076f088ff14eb40fde22c465be5ccb432032aa0 |
| Reports covered | 130 |
| Sealed | 2026-08-14T01:17:45.731Z |
| Bitcoin anchor | submitted to https://a.pool.opentimestamps.org — download the .ots proof |
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 130 digests sealed under this root
04ab3132520c5a0419c14793f19340e43cdf7563942bca5c975bcfdcb437d514 04ef9d3771f63d3ad896ed94d662e61fda2b833f3b0d80f333af79baa84c3010 067ffe491f85bacb6889ab69802d5571ded7de9bffe89f463b5d54a39adc86fe 075e896d7e5b8ddf9312a7d1d893b6fcee5c4f9432ba301623c6b6c01e1ec19a 092f48f1b9da26076d705366a2e64e695e424707c999843fc6e17b9c9088ec3f 0b30fe86ee1f985300e85f4fb9ada50e984e7659bececdbd2c5fecc1533605ec 0e5f3f27fb68524525ee91c9832b90bf8639e51e3aeb23da3026887c0379aaf9 142d325a395d20068878c2578fa3aebec69113c7ac34691074d59682e33a2afa 14f629ff9922335296813713c3262628d0a93086955dbbd598195a7e59d89e02 1530e3c9905b8dbff36a0130ddb1ca94f4ff75010f7d3809d93bd10130b75e35 15c59071ada2b5c3576b32e321eaec8f331380463f6aad196175a43fe07b2c90 169cccd0479b07e73f186452158a9d57788eb264700985bc620dc61d213f491b 1ba7d3ed8599fe4efe70190e1b8bbdb693f7c9cde435cb4da0c56e6d556548b6 22f253e1e42a31da62f26ce7714163513a2c4f2720ec6acd2820d378be5bb7d5 26fee5a194be5e0e0480b63131dfff78a185e02d31aac4ea54cb0cb617ad4fc2 2823eda893122b0c2eabb5c40236819eedd103967406096522b432fed34cdfbf 2858dcfa1f8e014838e2e70f354c69a7348e1a30a149b74a46fa2357d02f2f56 28fa000eb89d981f678f92a4bcc64acf9532e74bb78a1ecf04c83e71dff109e6 29441361f740f9fdfa300a796bffa6681093c019a3b7f1fe16523679f1813566 2a4e33df35356e689076d8ea467a668ea2ab83d72ac5f231eccb1259d391f552 30899abdaea70488de29086498b47e12b5a3f719387d6270e3a5dacb3b4f7768 3111e9589dadfaf6f877d5578827a8758bb179d0e800824dc0c35500de5b1396 31e3449503aae9eb28605e753f30cc39f9627de19b35310335c42678a7d88c27 346aad752fb9b2b90f27307b03ee153aa6859dc4f9c11749c6b5c3e1e9bf4004 39b497e9efcee85db66bd7df00bdcb5121ca8bc19c470590f879cf242afa4e33 3e2f8821dee86c80fd348729b9bcfe49761f088ad89ad2971351e1f336dfbef6 3f05eee7539e5538cd1d58f04dafb1a3c5ee75a7b41f1eadcda9c7144ac18f3f 3f26a13067f443abca524275bb0c5090033f66f853e24099da716c98c1442b1d 3f32bd5fc7837733a94bb82ea3c4c8016a98b62b4239ae122e9a554a206b1366 42d6024a5ddeb4cc6b3707d07c628f6c9157442217368fffae7fef17ce76c91d 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