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 0xa0fe614b04ce920ada2626a07c388debfc0fe8e68d8f96089481cfbad247614a. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/00e1452b-135e-42d4-b912-38fe7ed9c572.json and https://artists.proofprofile.net/proofs/artist/00e1452b-135e-42d4-b912-38fe7ed9c572.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Deutsche Hymnen - Klingende Dokumentation mit historischen Originalaufnahmen
Europahymne Ode an die Freude - Aufnahme 1994 Lissabon
Orchestre d'Harmonie des Jeunes de l'Union Européenne
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 0xfcea2d31cfe1fab91d70b3fbef2e29302eed1b8e1c7fd502ba4ab87947399ba4. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEE701803939 — a six-check JSON result.
Lied der Deutschen (3. Vers) - Historische Aufnahme, Mai 1933
Erk´scher Männer-Gesang-Verein von 1845 Berlin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a06b96b9dc65c5245fdc452a257a362f59c580924583fc19ec1573abe4ba63a. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/DEE702004093 — a six-check JSON result.
Was ist des Deutschen Vaterland - Historische Aufnahme, Reichssender Berlin 1939
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb55a3a32287e7331241aac332f7c570411da149226b548ceda4f1ff7f430da9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEE701903941 — a six-check JSON result.
Rundfunk-Jugendchor Wernigerode (Männerchor)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b93d13cbc6eb9164ad7f9e1b8a4024b8cefa99c266b483316e9265a4cd868b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEE700000722 — a six-check JSON result.
Die Wacht am Rhein - Historische Aufnahme 19. Mai 1905, Philadelphia PA
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc139f2085e4623433de1314ef1dac45cd910dea4d98eb8d9faeca1abb0752db2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEE701903942 — a six-check JSON result.
Heil dir im Siegerkranz - Historische Aufnahme Oktober 1901
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18f022d316c1582a46adaaf773d3a5e2f0e0f78023249c3ba7b14de274d0a90. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEE701903943 — a six-check JSON result.
Ein feste Burg ist unser Gott - Aufnahme 1990
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82805e20c9d6e13df1bd18cc45a0e57b8f5f489014c5436409915afee9463201. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE701203097 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c390bc8658a12a9232e072367a17c4411c788a2e4802fed37322dd4a53e5e1. 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/DEE701903944 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf824661219e4c84618ba82f56af22aae26b80c92cbbf1fb4c771f6432b030a6d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE700000796 — a six-check JSON result.
Zogen einst fünf wilde Schwäne - Aufnahme 2003
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eca660e4d2a9ce12ab51e16fd59668af7223122e325817a9384250057e225ed. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE700002240 — a six-check JSON result.
Sag mir, wo die Blumen sind - Live-Aufnahme 6. Oktober 1962 Düsseldorf
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f7b7d2913fea825d77006f0c97fffd15296e28c300fd29f3579c1a1bab06d8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEE701903945 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a5e9c3bdf0b5631dbb1d68208c7210342143486c6e43c5a8eb75af64140cc5. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEE700002291 — a six-check JSON result.
Anmut sparet nicht noch Mühe (Kinderhymne) - Historische Aufnahme 1951
Instrumentalensemble des Berliner Rundfunks
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161b57ada05b07a10e062735d805a4ecf441a4695b2a7afacb6811ddb0e8d518. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEG210240822 — a six-check JSON result.
Die Deutsche Nationalhymne - Nationalhymne der DDR (Auferstanden aus Ruinen) - Live
Solistenvereinigung des Deutschlandsenders
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fdfb6419afd3f19dab53057e617d12539b319e1f3c172323683e3ee46987e8a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEE701303173 — a six-check JSON result.
Deutsche Nationalhymne (Einigkeit und Recht und Freiheit) - Live-Aufnahme Deutscher Bundestag 24. 10. 2017
August Heinrich Hoffmann von Fallersleben
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e8bf63f92c18a0e6f40deecd08cf4c8d04545582f5b6856157e344e206527d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEE701903946 — a six-check JSON result.