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 0xeecd2f21f0dfad807f9a6bb950c49697b19884cea94831e7237d9a17cd927b7a. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e980b829-62f9-42cd-9d14-53137557bc4c.json and https://artists.proofprofile.net/proofs/artist/e980b829-62f9-42cd-9d14-53137557bc4c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mussorgsky: Boris Godunov, Prologue: Introduction
Orchestre National Radiodiffusion Française
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 0x6be7fc443f4b8b8de99d03b04ba78701b32c2e7097e55d30145fb107907d798a. 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/FRZ115206627 — a six-check JSON result.
Mussorgsky: Boris Godunov, Prologue: "Nu, chtozh vy?" (Officier, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f3a78576fe843ccde40f63fa5197227578d92610c8f6cff5cf38afae7fbce0. 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/FRZ115206628 — a six-check JSON result.
Mussorgsky: Boris Godunov, Prologue: Shchelkalov's Adress. "Pravoslavnye! Ne umolim boyarin" (Shchelkalov)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd152b6c5252c4570cd6e3ecb6ad1d53e7ac5242e729d8dbe21066996d1f39f89. 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/FRZ115206629 — a six-check JSON result.
Mussorgsky: Boris Godunov, Prologue: Pilgrim's Chorus. "Slava tebe, tvortsu vsevyshnemu" (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf549d01216327da0a2fb7d4c8c37581c66ea5a2750060a5c468a3f99c6bff397. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FRZ115206630 — a six-check JSON result.
Mussorgsky: Boris Godunov, Prologue, Coronation Scene: Introduction
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023ff563ef7d036454e21be25c3fff3f39bfb751cadadae0257c27dbb823e0b5. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206631 — a six-check JSON result.
Mussorgsky: Boris Godunov, Prologue, Coronation Scene: "Da zdrastvuet tsar' Boris Fedorovich!" (Shuysky, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddab92317cd7432f691362f17e332de866c2eb16c3d379c10a199bb301b715f5. 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/FRZ115206632 — a six-check JSON result.
Mussorgsky: Boris Godunov, Prologue, Coronation Scene: "Slava! Slava! Slava!" (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8125a8ce87251eb834d4883e09c2bd487771ff16f0c70e6eef37e9f3e3485baf. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206634 — a six-check JSON result.
Mussorgsky: Boris Godunov, Act 1: Pimen's Monologue. "Eshche odno poslednee skazan's" (Pimen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc94d47fea6bedcd550a90a6239fe6624c24a7382669051458a05d11b061731. 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/FRZ115206635 — a six-check JSON result.
Mussorgsky: Boris Godunov, Act 1: Grigoriy's Dream. "Bozhe krepkiy pravyi" (Chorus, Grigoriy, Pimen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea2a37e9999b8089dbb7f5efe440b8f0f4edfc68f0dcb102f01067c7eea23b3. 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/FRZ115206636 — a six-check JSON result.
Mussorgsky: Boris Godunov, Act 1: Grigoriy's Dream. "Ty vse pisal i snom ne pozabylsa" (Grigoriy, Pimen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e10e129de7eff851388bf762fc2607ddc189ca1bec23fbc602018e3e2f17a4d. 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/FRZ115206637 — a six-check JSON result.
Mussorgsky: Boris Godunov, Act 1: Boris' Crime. "Davno, chestnoy otets" (Grigoriy, Pimen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6924c75feedde9dd322fd2cab43793ec7bb3fec78a7e7db22764fe85d83bc47. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/FRZ115206638 — a six-check JSON result.
Mussorgsky: Boris Godunov, Act 1: "Zvonyat k zautreni" (Chorus, Grigoriy, Pimen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77bf5fd13aec58fcdc02ee99c1d79898bff49f2b0ee3f3c96fa050369339d32. 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/FRZ115206639 — a six-check JSON result.
Mussorgsky: Boris Godunov, Act 1: Song of the Hostess. "Poymala ya siza seleznya" (The Hostess, Varlaam, Misail)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da36e44ccc88221ea8aac284971d1634a708d82f0bb7668f5ceb6309ee91c30. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206640 — a six-check JSON result.
Mussorgsky: Boris Godunov, Act 1: "Zheno, mir domu tvoemu!" (Varlaam, Misail, The Hostess, Grigoriy)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d83e2366e2d290a3f12640799fc281c1d1e105038d17f08072340e4a198e60. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRZ115206641 — a six-check JSON result.
Mussorgsky: Boris Godunov, Act 1: Drinking Song. "Kak vo gorode bylo vo Kazani" (Varlaam, Grigoriy, Misail)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528c65ca794db3b7e1ffaea197f6b4ab806a7d33adc6010eedec9e96abfffd9a. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/FRZ115206642 — a six-check JSON result.
Mussorgsky: Boris Godunov, Act 1: "Kak edet en" (Varlaam, Grigoriy, The Hostess)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7556565ae697cb2fc64fd261393443a6ae1fc6542d6b1cef5f3cc06c654cd181. 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/FRZ115206643 — a six-check JSON result.
Mussorgsky: Boris Godunov, Act 2: Clock Scene. "Uf, tyazhelo!" (Boris)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df8164bea89b0081a32b65af427d92fe0d49731afe184f4111e75b91369a516. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FRZ115206657 — a six-check JSON result.
Mussorgsky: Boris Godunov, Act 4: Council of Boyars. "Chto zh, poydem na golosa, boyare" (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6926e0018cbf0651ab9a0315f5f7f3d3af4b0aaba7aa48e92fd424c261ebe8f. 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/FRZ115206675 — a six-check JSON result.
Erich Kleiber, Jean Martinon - The Decca 78s
Singers of the Century: Eugenia Zareska Song Recital (2019 Remaster)
Mahler: Lieder, Early Recordings (1915-1949)
Brahms: 8 Chants tziganes et autres lieder (Mono Version)
Schumann: Frauenliebe und -leben, Op. 42, Gedichte der Königin Maria Stuart, Op. 135 & Lieder (Mono Version)
Mussorgsky: Enfantines & Mélodies diverses (Mono Version)
Mussorgsky: Boris Godounov (Arranged by Nikolai Rimsky-Korsakov, Mono Version)
Chants d'Ukraine, vol. 5 (feat. Giorgio Favaretto) [Mono Version]