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 0x8ec3fffbf87f94c0cf4266e4f98e6a953344ca1b482bcc1a8e1e3bd4a764a7a5. 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/89263d9c-0838-4076-9085-45a3530560a1.json and https://artists.proofprofile.net/proofs/artist/89263d9c-0838-4076-9085-45a3530560a1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
De zaak Morgenstond - Onder verdenking [Severyn & Govaert 1 (Onverkort)]
Dood in opdracht - De zaak Dantzig [Severyn & Govaert, deel 2 (Onverkort)]
Levend verkocht [Severyn & Govaert, Deel 4, De zaak Babylon (Onverkort)]