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 0x470078b1429d017f73838c698714f169982f3b6d381f8b0e9e5eadeb7e8007f2. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0d58096-6680-450a-b1dd-12f03ce95a41.json and https://artists.proofprofile.net/proofs/artist/a0d58096-6680-450a-b1dd-12f03ce95a41.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Requiem in D Minor, K. 626: Kyrie eleison
Mozart, W.A.: Requiem in D Minor / Maurerische Trauermusik / Adagio in B-Flat Major
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 0x10b44f2b8f361ff6dfbd6bbe46595c9ce4fd0b90c7af77664f1bab1aa3bfd3a2. 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/ES7899900105.
Requiem in D Minor, K. 626: Sequence: I. Dies irae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671c91d1b538fe165e4174e36160ce9660863b55995869209000d3d9e002770c. 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/ES7899900106.
Requiem in D Minor, K. 626: Sequence: V. Confutatis maledictis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0b3fec96bfd78fbf72ec028bda13f5424dc6a6ae260c88259bf4c7574e4071. 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/ES7899900110.
Requiem in D Minor, K. 626: Sequence: VI. Lacrimosa dies illa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9cd122fbe5404e1463fff007368b1b896a100af6cbdee1e6a00433bf93c4ed8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES7899900111.
Requiem in D Minor, K. 626: Offertory: I. Domine Jesu Christe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1091e987a6b43dc9ce1c75d12d5a1b709e28067451b8974fefc31c8cf7fce647. 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/ES7899900113.
Requiem in D Minor, K. 626: Introit: Requiem aeternam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146fa55645f9ed46a9291346619a3921d0629578d1c901c7d1b455ed33a3f75e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES7899900104.
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
Requiem in D Minor, K. 626: Sequence: II. Tuba mirum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b5903ba5a988b93d6438c02031907b1590f4f6aa2b8973c08cf8cdd22eceb7. 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/ES7899900107.
Requiem in D Minor, K. 626: Sequence: III. Rex tremendae majestatis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3840f947e7b8efe330aedffc8570f2ef4ecc50093f3599ebf83f53805db1d31. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899900108.
Requiem in D Minor, K. 626: Sequence: IV. Recordare, Jesu pie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60211ee6c5667d9212e3ffae47f3b3c657cd6b3466bd0742d1c437fa7c6992b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899900109.
Requiem in D Minor, K. 626: Offertory: II. Hostias et preces
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22030983ba5272061704a4f28db826a491209682ff9ad0c8a6717ba49c492cdd. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/ES7899900114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11071734778e7f430315898925214bd2dca12a5d02bbaaad96848fc004615dc. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/ES7899900116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1fb7794a9d09060edd05a8dd82a2d6d941fb57c608fd9296abe8329e92526de. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7899900118.