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 0x6c56897cf21d5434a365b198620d31798840f44a9ffecc0a1d9d7ea2865270f7. 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/f579cb9e-04dc-4f85-8f33-e2dc6054e777.json and https://artists.proofprofile.net/proofs/artist/f579cb9e-04dc-4f85-8f33-e2dc6054e777.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mozart, W.A.: Clarinet Concerto in A Major / Clarinet Quintet in A Major
Klarinettenkonzert A-Dur, K. 622: 2. Adagio (Jenseits von Afrika): I. Allegro
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 0x30ce85b2a08bd2692c93e4dde0b60e9b207f731dc83ba8328c5e03cfb27bd1b0. 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/USASX0802001 — a six-check JSON result.
Klarinettenkonzert A-Dur, K. 622: 2. Adagio (Jenseits von Afrika): II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95fafc28e164025b341dadaa9d016736f0fc41a0fa5e0b6ae0f35c589df083ed. 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/USASX0802002 — a six-check JSON result.
Klarinettenkonzert A-Dur, K. 622: 2. Adagio (Jenseits von Afrika): IIII. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40fd2a535e6a8ffe9cb2aadf4cf7355e8c5922110e0208709a520ca59dad4aa. 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/USASX0802003 — a six-check JSON result.
Clarinet Quintet in A Major, K. 581: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc857ea6828f4887f39527e50a8d7d0289d99bbea9549123d078896e21f75ca7c. 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/USASX0802004 — a six-check JSON result.
Clarinet Quintet in A Major, K. 581: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9004e2b33591fae1a26205f796a7e1d24481b429f0f1feb57dfb48f8756dcbf6. 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/USASX0802005 — a six-check JSON result.
Clarinet Quintet in A Major, K. 581: III. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92cba4c95a6b7fdaae5d1fd8103c2176bd73123cb99fb3a5bb34f8882f46b63a. 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/USASX0802006 — a six-check JSON result.
Clarinet Quintet in A Major, K. 581: IV. Allegretto con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9950d89d56d1dedba9b9291a373e81f79f026a169eea5098488104a53404041. 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/USASX0802007 — a six-check JSON result.
40 Tracks for 40 Years: Delos' 40th Anniversary Celebration!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba81136bb850c93ee414fcd82543d1a3230a645e10429b42576d4003e0acfa4. 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/USASX1344023 — a six-check JSON result.
Symphony No. 6 in F Major, Op. 68, "Pastoral": II. Scene by the Brook: Andante molto mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece160d1ba96f9dc36181bd9ddb3c9cf370e017fd7f7cab3df51774f5c52684c. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USASX0860801 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2099ec833c916fc67f9dcee097bf71f63b6ad64b4beecec2883076eec4fe11cc. 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/USASX0860813 — a six-check JSON result.
Annees de Pelerinage, 1st year, Switzerland, S160/R10: II. Au lac de Wallenstadt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c02f0f365c2d556a99e5a6d63aac87847d9ac7ce4a2f8cef68c22f47cd2755. 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/USASX0860815 — a six-check JSON result.
Herz und Mund und Tat und Leben, BWV 147: Chorale: Jesus bleibet meine Freude (Jesu, Joy of Man's Desiring) (arr. for organ)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a730a323e6dd0e3de48aa73d30bfbb5b86b74a85af715dac7b17aa28d999d1e. 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/USASX0860830 — a six-check JSON result.
Carmen Suite, "The Carmen Ballet": VII. Zweites Intermezzo (Second Intermezzo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba2755facffdccb7cf5213b1bbc5312cd2a1b8ff30f73a78689df71d47d8abb. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USASX0860804 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f925db53593bc19ce4d7e44c21a06a050fb19660b1a14583d7e593c83e28f4e. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USASX0860817 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b725b25431c31d5f88f9eabc088625db450b110ade6509d067aa030fdf3e24c. 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/USASX0860818 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295b3373f4b9c8515806231eeb132ae0b4e0335e382585c9050720c17fa9e619. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USASX0860833 — a six-check JSON result.
Keyboard Concerto in D Major, Hob.XVIII:2: Piano Concerto in D Major, Hob. XVIII:2: II. Adagio molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a1b195ea3fef89ac3a54959a856eb09cb9f200e463dca6c8b0aa5900f5ebab. 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/USASX0860808 — a six-check JSON result.
Pavane pour une infante defunte (version for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d6058cf1cf0156f19e4d3c2a9f2c269e65af7fb53308a911c455014a22f10b. 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/USASX0860820 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758223faa50b51883b230320eefe528f319f8777058194c2b33a44e28c6c4071. 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/USASX0860810 — a six-check JSON result.
French Suite No. 5 in G Major, BWV 816: III. Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce72210b9260fcb0a34323e68d5bc9d05558fa9ef9cc0eda50758a32a1c1add. 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/USASX0860823 — a six-check JSON result.
Cello Concerto in D Major, Hob.VIIb:2: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36056112af24971cae8fec25d4956da2e32371f94a5a678f47b42005cf6196a. 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/USASX0860812 — a six-check JSON result.
Choral Music (Sacred) - Palestrina, G.P. / Durufle, M. / Holst, G. / Barber, S. / Dvorak, A. / Farrant, R. / Byrd, W. (Visions of Heaven)
Opera Gala - 35Th Anniversary (A Tribute To Delos Founder Amelia S. Haygood)
Musically Speaking Mozart Clarinet Concerto & Quintet
Auger, Arleen: Arias - Bach, J.S. / Handel, G.
Baroque! - A Collection of Baroque Gems From the Delos Catalog
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d00749ac772576acd102ccce7aa7bc858b8e9317e175d75f7819d102072e0ba. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/USASX0855609 — a six-check JSON result.
Soundscapes, Vol. 2 - A Delos Digital Compact Disc Sampler
Soundscapes, Vol. 1 - A Delos Digital Compact Disc Sampler
Giulio Cesare in Egitto, HWV 17, Act III: Piangero la sorte mia si crudele e tanto ria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c143fd27a5c8a8c79db250a1a4af65d6af56d461d7b6310551ec85e623ae136. 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/USASX0502602 — a six-check JSON result.
Rinaldo, HWV 7, Act II: Lascia ch'io pianga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643665bc5a076ab8a4051f8e0248856b286db2951bf665b3f059f23fbf373389. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/USASX0502606 — a six-check JSON result.