thumb|upright=1.3|Attic red-figure kylix c. 470 BCE: Oedipus ponders the riddle of the Sphinx, with the fate of Thebes at stake A riddle is a statement, question, or phrase having a double or veiled
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d0cc49da90a7b91e2e09fa13decebcfde1baf09fec15345dffce58fe7a38ff. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d577454-010d-4c6d-a8a4-0d6202447429.json and https://artists.proofprofile.net/proofs/artist/2d577454-010d-4c6d-a8a4-0d6202447429.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).