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 0x6d96c7e94184286fdb54dc15108dd48071177df56c3e56e608d74d88bb8ed359. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dfa096dd-95d6-4fa3-a887-7d189645ba75.json and https://artists.proofprofile.net/proofs/artist/dfa096dd-95d6-4fa3-a887-7d189645ba75.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Debussy: Images, Danses sacrée et profane & La mer
Danses sacrée et profane, L. 103: I. Danse sacrée
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 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 0xe469872dd7d503ada15fb1032e1b15cb5470cb05229d0aa7a96c2b6613cd5d29. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA550407093 — a six-check JSON result.
Danses sacrée et profane, L. 103: II. Danse profane
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c933c9e7220eb9d41e6c50a597634baf4eb606e4c6e3d7456252277a52144eb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA550407094 — a six-check JSON result.
Bartok: Music for Strings, Percussion and Celesta / Violin Concerto No. 1
Millöcker: Der Feldprediger (Querschnitt)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47991a2b7401137c1ad73cce77fde3ddff5549234df4b888edb09b4f42346ec6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960730819 — a six-check JSON result.
Concerto in D Major for Violin and Orchestra, Op. 61: III. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495882906de86d403de12d36964fb2c705d2a216bcfda350712e046a50d255d2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0709803 — a six-check JSON result.
Concerto in D Major for Guitar and Strings, RV 93: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a18d6be215207697f0f17fce14335d31b809c12f92f23f633870d8b99a01b88. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0713302 — a six-check JSON result.
Symphony No. 3 in E-Flat Major, Op. 55, "Eroica": II. Marcia funébre: Adagio assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe685c6f751600ec713471e34eb5afcc0db99cba2fb94bdd84358feb0d5047b19. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0718302 — a six-check JSON result.
Symphony No. 5 in E Minor, Op. 64: II. Andante cantabile, con alcuna licenza
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f018cea839f422b2f9e159da44a76de459cc101950a3ed61356df048b1e5eae. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0721202 — a six-check JSON result.
Missa Solemnis in D Major, Op. 123: I. Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01bcc58fc10dba1ba1418974a03fcb77f6030b0f49d28d9f91bded476613343f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0505701 — a six-check JSON result.
Chamber Concerto in D major, RV 93: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a18d6be215207697f0f17fce14335d31b809c12f92f23f633870d8b99a01b88. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0713302 — a six-check JSON result.
Missa Solemnis in D Major, Op. 123: II. Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1e122a20476b778b23cf1dbd32c019add549e02af1170016c04d70a1552660. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0505702 — a six-check JSON result.
Missa Solemnis in D Major, Op. 123: V. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08efef8259a40774f90c4d36e187b42eac8d39c31f745661d1781e28624dd4ae. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0505705 — a six-check JSON result.
Symphony No. 3 in E-Flat Major, Op. 55 "Eroica": I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7759302d7f661ad93c2baef249883e10deb88ff1e77ccfd98c11b42e85a182c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0718301 — a six-check JSON result.
Symphony No. 3 in E-Flat Major, Op. 55 "Eroica": II. Marcia funébre (Adagio assai)
Missa Solemnis in D Major, Op. 123: III. Credo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c071e7dac1f07e5015e6d86909d7b89f0930efb25508ddb2bfd99ac0baa2b7c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0505703 — a six-check JSON result.
Requiem in D Minor, K. 626: VIII. Sequentia: Lacrimosa dies illa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919e8ecb84823871162d0273ccab881907752e0cbe751aa5fb041a4ea2670d76. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0534908 — a six-check JSON result.
Symphony No. 40 in G Minor, K. 550: I. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa046cae4ad7ce4a4d039de0ebb32f345449230efd587b41a202fbfda061668c5. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0720005 — a six-check JSON result.
Die Zauberflöte (The Magic Flute), K. 620, Act 2: "Der Hölle Rache kocht in meinem Herzen" (Queen of the Night's Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90331e98a19c612a3546d057d9cf192fd3eb3559f35347806475192822d96308. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0719612 — a six-check JSON result.
Five Orchestral Songs on Postcard Texts of Peter Altenberg, Op. 4: I. Song No. 1
The 35 Most Evil Pieces of Classical Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd15e300cf5b0043d54902b7b2ad53d4526898c53102bb44e625e7a7d48780bc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0534704 — a six-check JSON result.