Igor Borisovich Ushakov (; born October 28, 1954, in Tallinn, Estonia) is a Russian physiologist, Doctor of Medical Sciences, Professor, Academician of the Russian Academy of Sciences. Honoured Physic
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 0x9ac2b7cb433b9fbcb5483a02c1c767f7012c4b53ecf93a0632b6bcd2fe452343. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/567e371b-ef22-4ba2-adbe-5864f8baae57.json and https://artists.proofprofile.net/proofs/artist/567e371b-ef22-4ba2-adbe-5864f8baae57.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Male Choir of Valaam Singing Culture Institute
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 0x80c02112890d1e7a0d8ad12efb70eeb29239d367f4960464817a7a263d946762. 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/CZH401105111.
Men's Choir of the Valaam Singing Culture Institute
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bcfbc1298bbb431300124d9bc79148c1bc156610a71cd2a57bc218f31d3beb3. 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/CZH401101042.
Russian Calvary, Part III: The Untimely Passover
Valaam Singing Culture Institute Men's Choir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee1a5c71996158ea1fc25ba5026686f646567293137859e74fe4111787dff531. 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/CZH401103841.
Russian Calvary, Part II: Devoted to the Memory of the Regal Martyrs
Russian Calvary, Part I: Devoted to the Memory of Russian Newlymartyrs
Orthodox Shrines of the Russian North: The Valaam Monastery of the Transfiguration of the Lord
Ne vveri mja chelovecheskomu predstatelstvu (Entrust me not to the help of man …) [Valaam Monastery Chant]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11e93bea373eff695b097c75ae51780ea0c3923c73edfc049d353d83de6aefb. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/CZH401103883.
Orthodox Shrines of the Russian North: The Tikhvin Monastery
Orthodox Shrines of the Russian North: The Solovky Monastery, Pt. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0843a3148157ffcc8c51dc2d8233725772b339854776f1f154d6b11b2c7c8942. 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/CZH401104055.
Orthodox Shrines of the Russian North: The Solovki Monastery, Part I
I shall open my mouth … [Eirmoses of the canon at the Matins, Tone 4, Solovki Monastery Chant]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743f9551627062e8bca38340171dc3e0f367864bb1ac34dfb90c7745708d90fd. 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/CZH401103904.
The Most High than the Heavens … [Solovki Monastery Chant] (arr. S. Trubachev)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2273eaeaef76a4dac5a1492d84f77b7f88917496ebae91748559d421726b0e6. 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/CZH401103913.
Taking up into Heaven … [The Small Vesper, Sticheron, Tone 1] (arr. I. Ushakov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7455d2ffc58ba8ab19a5a8a9de02d85369067df3e8fe118770d01da451577173. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/CZH401103910.
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
Orthodox Shrines of the Russian North: The Konev Monastery
Orthodox Shrines of the Russian North: The Kirillo-Belozersk Monastery
The Legendary City of Sevastopol: Russian Soldier's Songs of the Crimean War (1853-1856)
Canticles from the Time of Peter the Great
Songs & Marches of the Russian Imperial Army
May You Live for Many Years, Orthodox Russian Tsar! (Arr. I. Ushakov for Male Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa191ddc8ea7c4af98f0a99c01a92b83ce8a6358394df3ab270b5ce109df4cab1. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/CZH401110635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a0389d81280d289fe7d797e900c3632f75bfd7d4e40f011ee551b677a12a4e. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/CZH401110616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bdad285bf23ab80f07ae9272c12ab6412a1ca3ed3588e07c7e0f9013dfeb1e. 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/CZH401110650.
Eternal Memory (Arr. S. Trubachev for Male Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64609d1900d5d4b8253448ce388ec6ccc094bd3a0f8fbf2857a0ebadaab0ca3d. 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/CZH401110658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f0a000924b10a03f971eb1bd89b60f15d054c41e766cb7604e992ed949be21. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZH401110646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf630c535e103510be76ca5418ff331b1310074035ad06f455ad70cea974fcf. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/CZH401110648.
The Holy Cross Is a Protector of All Universe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db2268075e35ac05f39ca6eca66dff6293b82340696d0c30e86a5b7e732139a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/CZH401110661.
Kol' slaven nash (How glorious Is our Lord in Zion) [arr. I. Ushakov for male choir]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c677ce2a6519dc4f01e6b803e1794b249bee2115e3cf583f98fb5507cf40e13. 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/CZH401112903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff6cd4c168b7ef7c650d16b4a7217d759954ce74d2c2fe7fee34602e5675095. 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/CZH401105662.
Vigil Hymns of the All-Night Vigil: Male Choir of the Valaam Singing Culture Institute
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec2c7240f646e99cddcce6bd670b0d307c38c03fd70f039f0c47c2591324f39. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CZH401105528.
Let My Prayer Be Set Forth in Thy Sight (Arr. I. Ushakov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd209004d0bc0ec9aea92ceca17a3adf15e87a8caa92d8673835fed42154549c. 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/CZH401105529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62da889b6d0ea8b8f0827fabebea5d82f2958c1b77b589ae12559bc7780db04. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CZH401105135.
Warrior's Hymns & Songs of Russian Empire
Preobrazhensky Regiment March (Arr. for Male Choir by Konstantine Nikitin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2030e00f7d3ba15187db007f6c6e8da71189b92c98c2d4251b36de1d5a1049. 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/CZH401109836.
How Glorious Is Our Lord in Zion (Arr. for Male Choir by Igor Ushakov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ad869b01b68a9df0ce3bcc72031b630d58be6e49a3fb2b936c94731f91ab028. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/CZH401109833.
We Will Bravely Go to Battle - White Army Song
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d8351a2a8edb54482a6ed4fe720d5dd671aee71a404e52ed48f021cb7674d46. 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/CZH401109850.