Pearl Diver (1944–1971) was a French Thoroughbred racehorse and sire. In a career which lasted from 1946 and 1948 he ran thirteen times and won four races. His most notable achievement came in 1947,
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ffde1ba53b6171daaebf0c41a607efb5c34c627262bc1874ad86e3e4ef60826. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aa659282-fa3d-4734-a350-45266dead799.json and https://artists.proofprofile.net/proofs/artist/aa659282-fa3d-4734-a350-45266dead799.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
You Know That I Know That You Know That We Know
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