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 0x9c423d8ae449dac5aee1536f260a9bd7a54eb2b6d0e67e68c6293e6f077b4638. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4e8bd39-2188-44a6-829a-707cc370200c.json and https://artists.proofprofile.net/proofs/artist/d4e8bd39-2188-44a6-829a-707cc370200c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Aus der Verdeidigungsrede vor dem Leipziger Gericht 16. Dezember 1933
Георги Димитров: Из Заключителната реч пред Лайпцигския процес 1933 година