Imants Kokars (16 August 1921 in Gulbene, Latvia – 24 November 2011 in Riga, Latvia) was a Latvian pedagogue and conductor. His twin brother Gido Kokars was also a conductor. Imants Kokar has been chi
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 0x2d7a332d8e6ebae77389f74fc3f41c4e254644dbfb3cd854c507891313db88b0. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/47b4f276-e85e-4a44-9ffa-b4983af63ce4.json and https://artists.proofprofile.net/proofs/artist/47b4f276-e85e-4a44-9ffa-b4983af63ce4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xfe1cd27c81fc5fc1a1ac21ad5a6e7c4e2709384e3e380680afe6e931d4eca73a. 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/DEB790301949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd414d91bd42a586dba1bb1dd503c68e5e61622e2ef589bf82ded5051e4646823. 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/DEB790301942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68e3b34058ff90f9340eaccdbb1fe415bd598b87571164a614eeabe40abb70e. 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/DEB790301943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2712a8b379c5c73bb9586a97eb9c0547dbe9f794841b499caf885f87c4bb75b5. 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/DEB790301944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801ab4cdd27ca64b3c69154af4f29cce5bf94a6e6d2f8bb9fc4ebbe1c3aa87f2. 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/DEB790301952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8ff33645421256cb1f9ae81d3b3d11742f72aa233e923f0506be361479f60a. 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/DEB790301950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f9bf9505fa0e350dcf4876994f3beff175013b6a7303a82b4ae073b6d4ab1f. 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/DEB790301951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64be4d640d5fa088d858a34b1dfdfbf869332b8d87487fa069c40d9ad0cfe6e0. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USHM22367643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cadf5665bf88642c66cadca12fff5b6c86d9212e6fb97653d514278f70d429c. 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/USCGJ2387133.
Le quattro stagioni (The Four Seasons), Op. 8 - Concerto No. 1 in E Major, RV 269, "La primavera" (Spring): I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266340f846980e11c7624aec24b63c6e16c0e88c88afd3ad3f4ea074c4523d04. 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/SEWDL0721501.
Concerto in D Minor for Flute and Orchestra, Wq 22: I. Allegro
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Sonata No. 12 in D Minor, Op. 5, "La Follia": Variations over an old Spanish Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2612f8279865829c5ed7e381d8172b3e62a786fd110626fd6c447fb071e6fa92. 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/SEWDL9430578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2037d7e48fcd5edade9e7bac982236bba6e096f9d222fdddb62579bc521f9d32. 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/DEB790303443.
Solomon, HWV 67: The Arrival of the Queen of Sheba
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb2743274569acc97936c16c0193437ba2d06070489a6e4c2bc2f1bb47162ac. 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/DEB790401258.
Trumpet Voluntary in D Major (The Prince of Denmark's March)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfa3f7608971384a775a519047ddef9e70c00927c2e0923126191835f23eee1. 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/SEWDL0749710.
Concerto in D Minor for Guitar and Orchestra, FWV L:d 1: III. Un poco allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508a50437958764a08a03fa9ff85e8a7caa938d33196b6a916c63578f55b3880. 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/SEWDL0763003.
Le quattro stagioni (The Four Seasons), Op. 8 - Concerto No. 3 in F Major, RV 293, "L'autunno" (Autumn): I. Ballo e canto de villanelli: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa041e9e42438b6a2d1f0f7d0685dc5b56a410451de5df8301551c272a1e4a72e. 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/SEWDL0721507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1dba99a84431737059c28acad5bf9cdc9c160cc61a562d15087997cc0e007f. 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/SEWDL0794903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64316dc7060c92fb240d1d7997fe9d1b50dd876a6c5717b4fceb1b4d92a68730. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/SEWDL0711110.
Concerto in G Major for Viola and Orchestra, TWV 51:G9: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed0e377e7890cc4c4b9cbbc47f5a6488eb7e65616fb15d75b4e718d63006b86. 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/SEWDL0710604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7de4835953bc74808e9e1adc664ca400ea8e379505681490daeecce010e96d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/SEWDL9750007.
Concerto grosso in D Major, Op. 6,4: I. Adagio - Allegro
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Concerto in D Major for Trumpet and Organ: I. Pomposo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea17994ea19426fc9436d1a427a3214629f6e649cd9d1f3fde5231c66437da6. 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/SEWDL0706401.
Le quattro stagioni (The Four Seasons), Op. 8 - Concerto No. 4 in F Minor, RV 297, "L'inverno" (Winter): II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcace7395630a8352977e0bf6f2f79061361edfff075174ffee9c4cc57a085a07. 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/SEWDL0727809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098ea6819d198de2d670d9505f7eed998a9ed1d66734e878e4e207663d5c84c2. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/SEWDL6010397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b13565afc813db6d9da90689ec3dc02d861afd4d75b1a87c8a514b179699e9. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/SEAEE9030140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113bb5fc935fb7ee7f5507b9c4539895583c77e5fc05edeeec5de931baf4304f. 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/SEAEA9357060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2712a8b379c5c73bb9586a97eb9c0547dbe9f794841b499caf885f87c4bb75b5. 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/DEB790301944.
The 50 Most Essential Renaissance Masterpieces
L'incoronazione di Poppea (The Coronation of Poppea) SV. 308, Act 3: "Pur ti miro, pur ti godo"
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08bb3a1ebce1cda7ffa4efd9f05dbe79d424589f43351001020c72203f08479. 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/SEWDL0531309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c66a6f8b3112ff51b1b0c081591a8381b9503c9be3568de3517e4ea5e711186. 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/SEWDL0531308.
Cantigas de Santa Maria: No. 7 - Santa Maria Amar
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Lamento d'Arianna from the 6th Book of Madrigals: Lasciate mi morire
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864a6f5dcb23d5538de9a3ee40ef45f8395a6142633460de5a8c9c0e4ecec0c5. 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/SEWDL6019134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850378f1e2a7996007adc8aaa0847386d53a8cf1e6e48a9b5bb3ec999bc71286. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEB790301994.
Gianni Schicchi: "O mio babbino caro" (Lauretta)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0d44f302e0ff7812a41391a94f8965d1cf5a61461d2623376cabc4df39802d. 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/DEKB72072310.
Evolution of Classical Music: The 16th Century
From Liber leviorum Carminum, Antwerp 1572: Pavane sur la bataille
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68e3b34058ff90f9340eaccdbb1fe415bd598b87571164a614eeabe40abb70e. 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/DEB790301943.
Chorbuch European Folksongs (Gemischter Chor)
The 99 Most Essential Choral Masterpieces
Mass in B Minor, BWV 232: I. Kyrie: Kyrie eleison
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Mass in B Minor, BWV 232: IV. Gloria: Gloria in excelsis Deo
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Mass in B Minor, BWV 232: V. Gloria: Et in terra pax
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Mass in B Minor, BWV 232: IX. Gloria: Qui tollis peccata mundi
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Mass in B Minor, BWV 232: XIII. Credo: Credo in unum Deum
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Mass in B Minor, BWV 232: XVI. Credo: Et incarnatus est
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Mass in B Minor, BWV 232: XVII. Credo: Crucifixus
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Mass in B Minor, BWV 232: XVIII. Credo: Et resurrexit
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Mass in B Minor, BWV 232: XXI. Credo: Et exspecto
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Mass in B Minor, BWV 232: XXV. Osanna in excelsis
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Mass in B Minor, BWV 232: XXVII. Dona nobis pacem
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88 Holiday Classical Christmas:A Choral Festival. Celebratory Music for Holidays
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