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 0xca0253c73b5e6ca0318d05f147638e52d09a5820a7d5946774ef480b4aaffb6e. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8255d7b-ff6b-49ab-add6-5fb2717a69f3.json and https://artists.proofprofile.net/proofs/artist/f8255d7b-ff6b-49ab-add6-5fb2717a69f3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Claudio Abbado - The RCA and Sony Album Collection
Wunderbare Weihnacht' (Die schönsten Lieder, Chor- und Orgelwerke zum Fest)
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 0x069c6b851555c44212be07e75394144521d117bec0848a3c8152f80cda385528. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DES380001412.
My Heart is Inditing, HWV 261: IV. Kings Shall Be Thy Nursing Fathers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765c5c453f15e3fa084ab878d7f6beeff3e7aebcdce47615ece8a5e57052f64c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331508597.
Let Thy Hand Be Strengthened, HWV 259: I. Let Thy Hand Be Strengthened
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887977290d97da741ec78888874f77cfa0113555a6f7d38177174c4039168eae. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLY331508598.
Let Thy Hand Be Strengthened, HWV 259: III. Allelujah!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99df9b4af4337351840b45683675ea8706ec17c6e103720912ed8b552cb1634. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331508600.
The King Shall Rejoice, HWV 260: IV. Glory and Great Worship Hast Thou Laid Upon Him
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e1224c1f022471979c94649ffd7c0038fb6b6f377c35035789652605ac9409. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLY331508603.
Eisler: Goethe-Rhapsodie / Mitte des Jahrhunderts / Das Vorbild / Kriegsfibel
Schubert: Lazarus (Die Feier der Auferstehung)
Eisler: Tagebuch / Suite No. 1 / Tempo der Zeit
Beethoven: Kanons, Epigramme und Scherze
Martha Argerich - The Complete Sony Recordings
Burleske for Piano & Orchestra in D Minor, TrV 145
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e542bff9f25135d54d12802021b1a2584d096cdb2f2536f6b0c4415df1ae11. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10309168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc5c522f44f8d3c6996413eda8fce987aa770d2d5dc9acf592125f0ddf612f42. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ITB007671333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f927261245730db91cb2ea3d70d011814bd8180560ccd7dafc1fb2f74e9504f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM19402362.
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
Wunderschöne Weihnachtschöre - Maria durch ein Dornwald ging - In dulci jubilo - Wie schön singt uns der Engel Schar - Osanna in excelsis - Stille Nacht