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 0x9efc4f3cf2926d3ced93e6c7d71a88982c668457adc808bfb40f6b848842ce85. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb5b844f-6dcc-43b4-b223-d6f0c3fdfb8b.json and https://artists.proofprofile.net/proofs/artist/eb5b844f-6dcc-43b4-b223-d6f0c3fdfb8b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Howard Hanson Conducts American Masterworks
Howard Hanson Conducts - Moore/Carpenter/Rogers/Phillips
Chadwick: Symphonic Sketches/MacDowell: Suite for Large Orchestra/Sinfonia in G
Two Elegiac Melodies, Op. 34: The Last Spring
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d9ebcb4b80c0d807e74ba9342d6be49890ca776a1d73c360fc13192b4eb37e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA506201568.
Barber: Medea, Ballet Suite Op. 23 / Capricorn Concerto, Op. 21
Charles Ives: Symphony No. 3 / Three Places In New England
Piston, Cowell & Loeffler: Symphony NO. 3 - Symphony NO. 4 - Poem ’La Bonne Chanson’