right|thumb|upright=1.2|Doodle by Luise von Mecklenburg-Strelitz, Queen of Prussia, c. 1795 A doodle is a drawing made while a person's attention is otherwise occupied. Doodles are simple drawings th
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 0x065aa1d8980672fbf7fab3323d00d2f977c9c670e4c435cc8a74c4098dd3c284. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91720d2d-f6a8-458c-bc62-e2f97da9b3a3.json and https://artists.proofprofile.net/proofs/artist/91720d2d-f6a8-458c-bc62-e2f97da9b3a3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).