Tikhon Nikolayevich Khrennikov (; – 14 August 2007) was a Russian and Soviet composer, pianist, and General Secretary of the Union of Soviet Composers (1948–1991), who was also known for his politica
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 0x3e7187a6dd65b579b844e70315d1f1af1f16bfa5c61fcf1a5f554eed4c0210bc. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfb908cd-2477-4dfe-95bc-2055b2a0ccc8.json and https://artists.proofprofile.net/proofs/artist/cfb908cd-2477-4dfe-95bc-2055b2a0ccc8.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x111f637dd36400f0bbb0bfa63fa288fa2646ac4f54d9c0995d26c4e7462572b8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962200990 — a six-check JSON result.
Three Pieces for Piano, Op. 5: III. Dance - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a8d0af89302d098a13b35fd874bcfadaf7465c802924319e85fcc725500faa. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201000 — a six-check JSON result.
Five Pieces for Piano, Op. 2: I. Vivace - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4bcab37e7f515cdb1ce8eefc1d2f93747dbfbdee9cf8836ff4baf214391199. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201011 — a six-check JSON result.
Five Pieces for Piano, Op. 2: II. Andante con moto - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde5faf80b53806f5b93048cd203e7cb6862cec8f7d233f4ce68a8e325f1804a9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201012 — a six-check JSON result.
Five Pieces for Piano, Op. 2: III. Moderato - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1032dce2e28a4d4506b80e87353d747214c0b54945cddef68ebc2981df3b4275. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201013 — a six-check JSON result.
Five Pieces for Piano, Op. 2: IV. Andante - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c330a7217a5d95a28ad95065780bb85638b94b6cc98e1fc7c3b8dd648c0886b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201014 — a six-check JSON result.
Five Pieces for Piano, Op. 2: V. Allegro vivace - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56722804433457fa171e6e283402607fc3e5d2c89f0247eb5cece5acba9d2889. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201015 — a six-check JSON result.
Three Preludes: I. Allegro ben ritmato e deciso - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f2664d59d6696f58221b394d120246d8f6d7bd1888c91a064b58b8e3b099d5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201021 — a six-check JSON result.
Three Preludes: II. Andante con moto e poco rubato - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936f8f60b34f2a5c39fa062d7a6639de820888fcbbd793e1c46efb7ad13e26f2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201022 — a six-check JSON result.
Three Preludes: III. Allegro ben ritmato e deciso - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e477b8e8a19dc8506be08e4e544d201321f28dc957256a32faf0f7aaed8c80b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201023 — a six-check JSON result.
Nocturnes, Op. 62: No. 1 in B Major. Andante - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c7b6ea6284dfb8a71416376d662bd83a2195436935b3da2b586a7a89192beb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201030 — a six-check JSON result.
Impromptu No. 1 in A-Flat Major, Op. 29 - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672c09d9658e13e99c6c0f253e70cf406b1b52ec72c9f0841272758d94218871. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201040 — a six-check JSON result.
Impromptu No. 2 in F-Sharp Major, Op. 36 - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd91b1982b532fb3cc775ad9d38cb6ac354f18a926d28b5ec2f25b1ae6127e9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201050 — a six-check JSON result.
Impromptu No. 3 in G-Flat Major, Op. 51 - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea912fa5ef1435682f0469ab0eebb7aa45b0dd19f959f8195c1bc9fa0690fee. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201060 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cae4a6f82e7f97e873eef295c88c406fee1c677c80331cd59d26a0d2302d85a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201070 — a six-check JSON result.
Polonaise in A-Flat Major, Op. 53 "Heroic" - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68dde2223bb7543b14eedfacee70c44836b1c0800fee9bab1e77bfa48c263123. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201080 — a six-check JSON result.
Lieder ohne Worte, Op. 38: VI. Andante con moto in A-Flat Major "Duetto" - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e2e0f04bf0723f16e18f8ac188a08236b249c33015b53a2243c7277d420a57. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201090 — a six-check JSON result.
Four Piano Pieces, Op. 1: II. Dodecaphonic Tango - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf45f535c9cfa137ca0cbbfbe01ccac8b5b829e1f72359222a5b8617307a39d2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201100 — a six-check JSON result.
Scherzo No. 2 in B-Flat Minor, Op. 31 - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766dddaf65688587e69e10c040936de46f34c0d666d8b6eb126785276358ae72. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201110 — a six-check JSON result.
Suite bergamasque, L. 75: III. Clair de lune - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0e8c0526d614a9beb92a8527b5b5cc82db61c133571a0254fc1ab741aad4e8. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962201120 — a six-check JSON result.
Tikhon Khrennikov: Symphony No. 2, Op. 9 & Concerto No. 1, Op. 14
Tikhon Khrennikov Three Songs For Violin And Orchestra, Op. 26