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 0x3d6c2c046bf63faf6ec4a60c92bcbdf8e453f7c8f11605e6393509e0c4f7501f. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d96cee4c-2ad0-42b5-b56f-e570f31f1fe4.json and https://artists.proofprofile.net/proofs/artist/d96cee4c-2ad0-42b5-b56f-e570f31f1fe4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Russian Vocal School: Ivan Kozlovsky (1947-1957)
Legends of Bolshoi: Highlights from Russian Operas (1947-1957)
The Symphony Lounge, Vol. 11: Khachaturian — Highlights from Gayaneh Suites, Spartacus & Masquarade
Rimsky-Korsakov: Complete Operas & Fragments
Tchaikovsky: Complete Operas, Fragments & Incidental Music
Tchaikovsky, Gounod, Mussorgsky & Others: Opera Arias & Scenes
Beethoven, Mendelssohn, Brahms & Tchaikovsky: Violin Concertos (Remastered)
Michail Iwanowitsch Glinka: Ruslan & Ludmilla
Peter Tschaikowsky: Die Zauberin (Tscharodejka)
Die Zauberin (Tscharodejka): Erster Akt - Szene: Balakin, Paissi, Foka, Kuma & Potap
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 0x2b1ae72787ccd802c1bd22538b02740106c94c1a81ad3224ecbabea0062a87b2. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/DEAF70918447.
Die Zauberin (Tscharodejka): Erster Akt - Chor der Gäste
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0148061adcb16cfccad2353a482fe331a32ccc11eda8f0e28cc33da790213e30. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEAF70918449.
Nicolai Rimski-Korsakow: Mozart und Salieri
Christoph Willibald Gluck: Orfeo Ed Euridice
Tchaikovsky: Piano Concerto No. 1, Op. 33 - Violin Concerto, Op. 35
Tchaikovsky: Fantasia on Russian Folk Themes - Sinfonietta - Capriccio on English Themes - Slavonic Rhapsody
Swan Lake Suite, Op. 20a: I. Scene "Swan Theme". Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e412581ca87977501cdf08f4203ee4931348ffe2d79036d7b33bf75a404cfe. 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/DEF057801272.
Swan Lake Suite, Op. 20a: III. Danse des cygnes. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb7df652b14a7b54541ca3ff698ccdabe997885031ef7b5d5f7a74f514400a1. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057801273.
Swan Lake Suite, Op. 20a: V. Czardas. Danse hongroise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d113019f55a403df2e0e1bc11db35b966c2c8ef5d13db37bbbfed735fe0da89. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/DEF057801275.
The Sleeping Beauty Suite, Op. 66a: IV. Panorama. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4ad99974d28a706a58062035e205f287cf383c315c04966c8021bf3a6a44bc. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEF057801265.
The Sleeping Beauty Suite, Op. 66a: III. Pas de caractère. Puss in Boots
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b9a764a42f8a87605d50a8d18a873d91093115700e8c3e8d02c5fd251d1bf1. 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/DEF057801264.
The Nutcracker Suite, Op. 71a: IIa. March
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba50387dfcc63a021ec362e6208722c679177bc8baca6dff4198eae75f0da5d. 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/DEF057801283.
The Nutcracker Suite, Op. 71a: IIb. Dance of the Sugar Plum Fairy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475fd7e8eb31d9170ba45b1379b808e62fef9c90325b7b317d3d17ac4b1db6a6. 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/DEF057801284.
The Nutcracker Suite, Op. 71a: IIe. Chinese Dance (Tea)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0dce34f69f289dbb769b062925e7afb7e8b9eed92e5753706285f258756e691. 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/DEF057801287.
The Nutcracker Suite, Op. 71a (Arr. Economou for 2 Pianos): IIa. March
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1f3febd5ed1813bb9b36e14b605d2b5b43a26bf09e8c58e8a90a46c6c3aa5a. 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/DEF058302052.
The Nutcracker Suite, Op. 71a: IIc. Russian Dance (Trepak)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f07ee0fdc450484234088b21a11a737fb45048a5cacb6606e37273bc505f5dd. 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/DEF057801285.
The Nutcracker Suite, Op. 71a: IIf. Dance of the Reed-Pipes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7541f32399eb3379fa7e93048be69161dda6f328c9470e6ab87183179716a9ec. 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/DEF057801288.
The Nutcracker Suite, Op. 71a: IId. Arabian Dance (Coffee)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6451a6182e1f66d54e5a22d03f33310011e01d2622f5a552e2c7c13a9a5214f. 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/DEF057801286.
Variations on a Rococo Theme, Op. 33: Var. 1. Tempo della thema –
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289e13e53f184cec20f8d62c0a6b7265da191f84ec14dea3c160e435714853e9. 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/DEF056800363.
Variations on a Rococo Theme, Op. 33: Introduction. Moderato quasi andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff0ae2b38d6d185616ed50cc096903dbe4ea40aebc3c927b3f0e137ae9249ce. 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/DEF056800361.
Variations on a Rococo Theme, Op. 33: Var. 2. Tempo della thema
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9009526f2a3e0f0d8f96ab0fb38d06b55c18ce900bca73ee6e9e03759f85290. 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/DEF056800364.
Variations on a Rococo Theme, Op. 33: Var. 4. Andante grazioso –
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238da7b98e0a7e079c47f29967b09ee319e34aaca3f232ce8b128c23124270ed. 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/DEF056800366.
Variations on a Rococo Theme, Op. 33: Var. 7 – Coda. Allegro vivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x251087db1b4f620361ba5f4c8b656d34c5606712b9b4daf00735411987b551d2. 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/DEF056800369.
Variations on a Rococo Theme, Op. 33: Var. 6. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4e694794cdd7683d28b26004c49e5f7da5f1ffb3906a1028a8c36326981ba0. 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/DEF056800368.
Variations on a Rococo Theme, Op. 33: Var. 3. Andante sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84649b2cbfd47b5e353789a7da62416861b0de89705dcd2ef46a6f6dd85da2d5. 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/DEF056800365.
Romeo and Juliet, Ballet Suite, Op. 64a, No. 2: IV. Dance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9320b28fd47bc3ac2131163a678b6e2972e287560eeefec370f1141f66f3e12c. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEF058202030.
Romeo and Juliet, Ballet Suite, Op. 64a, No. 2: VI. Dance of the Maids from the Antilles
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e5a021f99b401eb0861da28474bd08298d8dc519ab9609d9a106e461cc83ac. 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/DEF058202050.
Romeo and Juliet, Suite No. 1, Op. 64a: V. Masks
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1496ece159f897254fa171fe320cfbb7197fe439f4623273fec6ff5e86b2e3. 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/DEF058201970.
Romeo and Juliet, Suite No. 1, Op. 64a: II. Scene (The Street Awakens)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0b34f8a44efa764de398d37b5c9010547863cabc004e2504be95379c3f284e. 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/DEF058201940.
Kinderszenen, Op. 15 - Cello and Piano: Träumerei
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf198e3b6e7f01013545d9614ade5467f965398262bb448113b0d3cd6abc9fe. 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/DEF057631714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956297be09d7951b96f4f2fa746f4a26a7b2b87c2e239d963d0738ffe1c03893. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057631719.
Tosca, Act II: Ed or fra noi parliam da buoni amici
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a68b36e9191e6a9bc53557ac5a0768a39b442738f1b65d0f899e67e4c2dadf. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/DEF057631726.
Tosca, Act II: Nel pozzo, nel giardino! – Floria ... Amore...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c475770fdb654871a46be84a54d516e424da1bbf7d4fde99f572331827cc41f. 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/DEF057631729.
Cello Sonata in G Minor, Op. 65: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd079b04073387a9629bb015958ca614a4b60200448c8517b939a1e1fedd94700. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEF058000041.
Cello Concerto in C Major, RV 398: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740a9c42a94d4d1717f67596d80c16c356363b5b38eac86cd1e7789ac3e944b1. 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/DEF057700271.
Cello Concerto in A minor, Op. 129: 2. Langsam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0304666e93e390693d01a92685b5349f5893faa4efb66164f875cd05a6c70434. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF055709302.
Wagner: Lohengrin, WWV 75 (Sung in Russian)