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 0x19dfeede17d756e6da7b138c05d896384ccb0fb35a9c1913b51e266dfff0cada. 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/1aa31679-e55d-4110-9b82-b6d0202f9bcf.json and https://artists.proofprofile.net/proofs/artist/1aa31679-e55d-4110-9b82-b6d0202f9bcf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Requiem in D Minor, K. 626: I. Requiem æternam (Introitus)
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 0x6d23026bae172d5e116bf1eb068b464cf35f22c3b4526afeea79cad0b3f2d824. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131401010.
Requiem in D Minor, K. 626: II. Kyrie eleison
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2bcae0c2c082f7999f64ffb7757a520ded49a9336384f9970c0ef5a67c54c4c. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/FRZ131401020.
Requiem in D Minor, K. 626: III. Dies iræ (Sequenz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d06a11187041801b103427452df84594a56015e558228d8634ef9eb396a0a6. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/FRZ131401030.
Requiem in D Minor, K. 626: III. Tuba mirum (Sequenz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcce5df60a92f389c80432370d2908344202aeb872bf045477fc164cd67092c8. 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/FRZ131401040.
Requiem in D Minor, K. 626: III. Rex tremendæ (Sequenz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2271d29b616f67cd7fa14a9eda54833ac38733eda0683bea9cac30c2bc291e79. Chain 2 (Bitcoin): anchored in block 957034 (2026-07-07T11:52:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131401050.
Requiem in D Minor, K. 626: III. Recordare (Sequenz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe29cd683fe053d81dfa35052d8e4b86409dd139aabbe873909c83a5b4beebee2. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/FRZ131401060.
Requiem in D Minor, K. 626: III. Confutatis (Sequenz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96bb5d760378d71f6fc29b655bd53e58ec6f41c0ca12e769f7421c04e26edd5. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/FRZ131401070.
Requiem in D Minor, K. 626: III. Lacrimosa (Sequenz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46826b0da406e61bdf4ae5ecfba8141e0ad79c04404ae1df83cad96cb146b00. 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/FRZ131401080.
Requiem in D Minor, K. 626: IV. Domine Jesu Christe (Offertorium)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d8b2e58b802ad6b890494fde09efbfe2fbd2829fe593a6850d64a08ccbdc80. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131401090.
Requiem in D Minor, K. 626: IV. Hostias (Offertorium)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5879e41548d440a1940058ab01f0958dcfd24e66dd7654f4a35da00cb0877af. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/FRZ131401100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd060c0e5cd90d0e3d2bf177049e072ae8c8da3fd277c53be1549ad77ada114ff. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131401110.
Requiem in D Minor, K. 626: V. Benedictus (Sanctus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdadb7995d6920c39ef41322dbc885950d9c1263ca302251c43020d93218c9825. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131401120.
Requiem in D Minor, K. 626: VI. Agnus dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56d40761f0adf46abb3ddf6c1d27f0bb6563f95c9ee88104222cebbea16794c. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FRZ131401130.
Requiem in D Minor, K. 626: VII. Lux æterna (Communio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f0dcb1645009312472b3d469d41620d8df6d0a6015841bdc9a2d7e098cc2e4. 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/FRZ131401140.
Beethoven: Symphony No. 7 in A Major, Op. 92 (Arr. for Double Orchestra by Laurence Equilbey): II. Allegretto
Mozart: Vesperae solennes de confessore, K. 339: V. Laudate Dominum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7719bf55193618a46fea1ac4bc98d94fd9bfce4f6880f2b56ee159796b1bb1c. 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/GBAYC1602388.
Mozart: Mass No. 15 in C Major, K. 317, "Coronation": I. Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d538a9ef853739600d38c9e397e841f3714eb979a1133eefe66ffcb11721a2b. 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/GBAYC1602372.
Mozart: Mass No. 15 in C Major, K. 317, "Coronation": II. Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad35e5810c39c830381ecf5813c31b7f03a75f12c33ceff3b5d1b89df151075. 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/GBAYC1602379.
Mozart: Mass No. 15 in C Major, K. 317, "Coronation": III. Credo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf72de490faa3fe972badd168f88476250f7e7549e1fc5769c62359ffe90f1bf. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1602380.
Mozart: Mass No. 15 in C Major, K. 317, "Coronation": VI. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987bf09efe75d53623ae66c1787a50206668bda309fbbec49e213a5823197f32. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBAYC1602383.
Mozart: Mass No. 15 in C Major, K. 317 "Coronation": V. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0906c13cb4766eb06b3b6e9b0c795a4f7b8f47747bd085384b818aa3c56cabc0. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBAYC1602382.