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 0x7899de9272790e1c8f9995221644721805622838e9a649143f9fcf7cf63f1058. Chain 2 (Bitcoin): anchored in block 953867 (2026-06-16T01:09:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0621f7c6-02c4-4a6a-bedb-07462d7dde5a.json and https://artists.proofprofile.net/proofs/artist/0621f7c6-02c4-4a6a-bedb-07462d7dde5a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
A Stranger Came to Town (Halal Docs) [Original Soundtrack]
Andere Tijden Sport: Willem (Original Documentary Score)
Mijn Dochter de Vlogger (Original Documentary Score)
De Migrant (Original Documentary Soundtrack)
Music for City Gazing: Singapore Light Festival
Volg Je Me Nog? (Original Documentary Soundtrack)
Sara's Mysteries (Original Podcast Sountrack)
PIM: Twintig Jaar Na De Moord (Original Podcast Soundtrack)
Long Covid: De Schaduwpandemie (Original Podcast Soundtrack)
De Sneeuwman (Original TV Series Soundtrack)
De Coup van Qatar (Original Podcast Soundtrack)
Hier Hing Een Schilderij (Original Podcast Soundtrack)
Ik Wil Je Nog Iets Vragen (Original Podcast Soundtrack)
Waar Is Sarah? (Original Podcast Soundtrack)
Hoe Kaas De Wereld Redt (Original Podcast Soundtrack)
Zo Dood Als Een Pier (Original Documentary Soundtrack)
De Zaak Rombley (Original Documentary Soundtrack)
The Reclaimers (Original Horror Soundtrack)
Handicapable (Original Series Soundtrack)
Spijtmoeders (Original Documentary Soundtrack)