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 0xc22b4437c3dede17164278a62684d8fde4d9a37636ae102b96aaf7f9eb20331a. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a012c829-69e7-4c51-aea8-e0cf8c408b56.json and https://artists.proofprofile.net/proofs/artist/a012c829-69e7-4c51-aea8-e0cf8c408b56.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Requiem in D Minor, K. 626 (completed by R. Levin): Introit: Requiem aeternam (Chorus)
Mozart, W.A.: Requiem in D minor, K. 626
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 0x3b2ad1975cd4304e77db2a05dc3bcd5af1a5fdb8b5c48bd4864ed2bb39ec257b. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USKC60714363.
Requiem in D Minor, K. 626 (completed by R. Levin): Sequence No. 5: Confutatis maledictis (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882cff5e65faba27c1b43f01470cd10fac8e5f6a90eb7ef592c0bdd815df0fbf. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USKC60714369.
Requiem in D Minor, K. 626 (completed by R. Levin): Sequence No. 7: Amen (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb68c602b102086dc1c15f1ca1d2134eec97e678d42b876415c119bcedac007. 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/USKC60714371.
Requiem in D Minor, K. 626 (completed by R. Levin): Offertory No. 1: Domine Jesu Christe (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10cfa3f6ce94e6781a1bad2c3bd95ea098621ac3b78debba57ec3a0eb184582. 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/USKC60714372.
Requiem in D Minor, K. 626 (completed by R. Levin): Communion: Cum sanctis tuis (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046dee5523f9ecf64a1332a7125a31614a5d1f19f72ead2bc712f103b9a4d2e8. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-21T23:38:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USKC60714378.
Requiem in D Minor, K. 626 (completed by R. Levin): Kyrie eleison (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8131fa541b7e12351ac22255cebb6055a3590972fe8ddbcf4dfefb8a460ca396. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:01:18Z), 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/USKC60714364.
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 (completed by R. Levin): Sequence No. 3: Rex tremendae majestatis (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118dc41110f07c6926b4058f142ef86b6e16e7ffc95ae946de8aff1a6f6aec75. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:11:46Z), 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/USKC60714367.
Requiem in D Minor, K. 626 (completed by R. Levin): Sequence No. 4: Recordare, Jesu pie (Soprano, Alto, Tenor, Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85020c3f013ed27c192ec15251666fa5936ad7c3805d8ff0113e6b900144f592. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USKC60714368.
Requiem in D Minor, K. 626 (completed by R. Levin): Sequence No. 6: Lacrimosa dies illa (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f400d7f7f08966cbcbd00bfdff3b9f78f35260b6727c482a5629418f0eaed28. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USKC60714370.
Requiem in D Minor, K. 626 (completed by R. Levin): Sequence No. 1: Dies irae (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7157896295a8b665d6795c0d8d26fab4656ecfa09d6ab08c3cfe17b6302e6ec4. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/USKC60714365.
Requiem in D Minor, K. 626 (completed by R. Levin): Sequence No. 2: Tuba miram (Soprano, Alto, Tenor, Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376b62bfcc0f390e2103b8f6979f86656e47356e0ee3a00d912d39111309ae9c. 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/USKC60714366.
Requiem in D Minor, K. 626 (completed by R. Levin): Offertory No. 2: Hostias et preces (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cac7448b33bbe774d49edf8f1c613d403282d2568e849861c71d1ab58bf12a6. 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/USKC60714373.
Requiem in D Minor, K. 626 (completed by R. Levin): Sanctus (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d254b0f07ea6a76fc1425762410b00da0e31a6cb383b1564a409764e43e889e. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/USKC60714374.
Requiem in D Minor, K. 626 (completed by R. Levin): Benedictus (Soprano, Alto, Tenor, Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cedc151cf69dfce28b7316277dffee29fd4d045ad847cf735dee7766f1434f9. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USKC60714375.
Requiem in D Minor, K. 626 (completed by R. Levin): Agnus Dei (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38afe17e11b39e83b1edc065e95d2a86ce74937dee90cf4ae6d404c437f15d37. 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/USKC60714376.
Requiem in D Minor, K. 626 (completed by R. Levin): Communion: Lux aeterna (Soprano, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5645a47748b7ef2705cf049c34c6d051dea75e095a607df6984719f88c215ab. 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/USKC60714377.