thumb|Cartoon showing William Ewart Gladstone in a dilemma: If he climbs to escape the guard dog he will face the man's wrath, but if he drops to avoid the man, the dog will attack him. A dilemma ()
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 0xd04b919687e806e50133041b1a800cb038e0a34edb1867455efd96159c36ac13. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49c84d78-da9b-4d8c-999d-b8bcc1379883.json and https://artists.proofprofile.net/proofs/artist/49c84d78-da9b-4d8c-999d-b8bcc1379883.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).