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 0xbf45eb9b7796ae44468dd613ed68ee8e9d71e13922ff3433e4c3a6ebbeae56d5. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c79ccc2-40c3-4544-8d05-0d9eda278d12.json and https://artists.proofprofile.net/proofs/artist/4c79ccc2-40c3-4544-8d05-0d9eda278d12.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Berte, H.: Dreimaderlhaus (Das) [Operetta]
Krenek, E.: Diktator (Der) / Schwergewicht, Oder Die Ehre Der Nation / Das Geheime Konigreich [Opera]
The Essential Warsaw Philharmonic Orchestra
Requiem, Op. 89 B. 165: Introitus: Requiem aeternam - Kyrie (Vocal Quartet, Chorus)
Orkiestra Filharmonii Narodowej w Warszawie
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 0x782447bc0f97c24b38bcfd7b56b4375779281709eedbd8edf3315f842db1d812. 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/HKI191413601.
Requiem, Op. 89 B. 165: Graduale: Requiem aeternam (Soprano, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd551b159862323fb22a10ce0c19522c91ea041fdf2cab7074e2bddb02b4275. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/HKI191413602.
Requiem, Op. 89 B. 165: Sanctus (Vocal Quartet, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb556b72c8c63bdac815db24f4e425a4a035985148e38545afdf41256f63eb6f3. 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/HKI191413703.
Requiem, Op. 89 B. 165: Sequentia: Dies irae (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f456410a45cfef53242619af36cf3dba806e21c246ade6bfafdc8bad03265cd. 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/HKI191413603.
Requiem, Op. 89 B. 165: Sequentia: Tuba mirum (Alto, Tenor, Bass, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411349b845d86b12a5846dc45ccad09a2b3f0f047ef832ab068286afc9f079e6. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/HKI191413604.
Requiem, Op. 89 B. 165: Sequentia: Quid sum miser (Vocal Quartet, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f94927b8c6fb2c3882421276a6b279d6831ae5bc64990f396e50f64da2adb43. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191413605.
Requiem, Op. 89 B. 165: Offertorium: Domine Jesu Christe (Vocal Quartet, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b3b73d089ede8faee8ef7f3db99a7d8c49a3cb90aa069c480e28cbe6c51c54. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/HKI191413701.
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, Op. 89 B. 165: Offertorium: Hostias (Vocal Quartet, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf560089ea916f96495f1627330ced8b4e59efb6e0369c5106c6b93c4d9722063. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/HKI191413702.
Requiem, Op. 89 B. 165: Pie Jesu (Vocal Quartet, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38592101cab8a0d88aa8b832a47ab3e725c79f60d7704069d30eca90bd7f27e. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/HKI191413704.
Requiem, Op. 89 B. 165: Agnus Dei (Vocal Quartet, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f650a3fb56fe1c688b3ad537322defa48b2986593184540697df5d24adbe18. 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/HKI191413705.
Requiem, Op. 89 B. 165: Sequentia: Recordare, Jesu Pie (Vocal Quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71aa7aa0717f37a5c9b09156f9f0044907a1b06d5df513bb3f7aee1e832114d8. 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/HKI191413606.
Requiem, Op. 89 B. 165: Sequentia: Lacrimosa (Vocal Quartet, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3083c7616bd1023fb82147730d83733e371d28b22d5d30dd6f0ad0674a449ff. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/HKI191413608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e26788e888e319daea7e31ba908b04680d85bcd8b3f511b180400b856dd316. 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/USB8U1700937.
Albinoni, T.G.: Concertos, Opp. 5, 7 and 9
Toch, E.: Princess and the Pea (The) [Opera] / Das Hassliche Entlein