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 0x54c497053d2ef7e27aa1beef18d88293b8b8a52e739b575609ee4312cb2faf7d. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f038feaf-9cbd-439b-a21e-352f1e893e0c.json and https://artists.proofprofile.net/proofs/artist/f038feaf-9cbd-439b-a21e-352f1e893e0c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Prince Igor, Prologue: Introduction "Knyzya, pora nam vystupat"
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 0x8143cfe3cfbd96685a35ed87c14cd99c2d08cb6879fc47d56ca3aabcf7db6c54. 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/UK2Y21602940.
Prince Igor, Prologue: Introduction "Pust pridut knyagini i boyaryni"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa7fa77229a46165d137faa7474aa34f75da7a3f602aa82706f55e479e62de32. 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/UK2Y21602941.
Prince Igor, Act II: Prince Igor's Aria "Ni sna, ni otdykha"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7b5e0f8767f83a14ec33ee371f4fc6cf8f8c200442a11b013993befa6fe93d. 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/UK2Y21602960.
Prince Igor, Act I Scene 1: Recitative "Knyazyu Galitskomu slava!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c53383720d0cf854919ffa2947a88ac67ae16c3a51eab53490f89611d9dd206. 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/UK2Y21602944.
Prince Igor, Act I Scene 1: Scene "Stoy, rebyata, slukhay!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc81da8b3f6ea8ee4ea6ca6e8dcec2264869653497f2b4810858449aa86794fc. 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/UK2Y21602946.
Prince Igor, Act II: Polovtsian Dance with Chorus "Uletay na krylyakh vetra"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c697e884e034d4d9b5caf38e57820a8e15b64493b7f602a67d7352c63e249b. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/UK2Y21602964.
Prince Igor, Act I Scene 2: Yaroslavna's Arioso "Nemalo vremeni proshlo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ac04eec862588d15ab6119f9c3000c81042a38cd20900b2908b5941d3d0b74. 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/UK2Y21602949.
Prince Igor, Act I: Finale "Dobro pozhalovat, boyare"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9138028e5c6ad9065bcb2c35cb08b78fd9cdec93743f0f30d0d97088a8e2e7e1. 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/UK2Y21602952.
Prince Igor, Prologue: Introduction "Idem na bran s vragom Rusi!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5cfbc24c0f97912653f583196da27d37ae66222383ad9b7f28008c130364b9. 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/UK2Y21602939.
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
Eugene Onegin, Op. 24, Act I Scene 1: Introduction
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5710e5b33d50808cf9e7ea8a12d03554729123a0d2be14890d1c8cd590fec2. 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/UK2Y21309063.
Eugene Onegin, Op. 24, Act I Scene 1: No. 1, Duet and Quartet "Slykhali l vy?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e97e63bb75e122f5fca7cb45173434d199474b0e3923ebe57f5a354ac3026e1. 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/UK2Y21309064.
Eugene Onegin, Op. 24, Act I Scene 1: No. 2b, "Zdravstvuy, matushka-barynya"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8e401aaa0aa9e855aeef5d01707b085c39cf20cf5cef88a2e029a2b3034547. 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/UK2Y21309066.
Eugene Onegin, Op. 24, Act II Scene 1: No. 14b, Scene and Triquet's Couplets "Kakoy prekrasniy etot den"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70b0f12a5792d58b33c9aacc9fd025a51a49f8874522dba249df4efe1aa3d07. 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/UK2Y21801585.
Eugene Onegin, Op. 24, Act I Scene 1: No. 2c, Choir "Uzh kak po mostu-mostochku"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e017f99d73f6e06770daddbd437fe08d571d92e094d3dd7c1bb35142e42fbde. 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/UK2Y21309067.
Eugene Onegin, Op. 24, Act II Scene 1: No. 15a, Mazurka
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6f5f8b598b8d9d983d9ae063d0b77c4378571154f1e927faa9e9503dd61d39. 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/UK2Y21801586.
Eugene Onegin, Op. 24, Act I Scene 1: No. 3a, Scene "Kak ya lyublyu pod zvuki pesen"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b6613fc1a07f447032c98a7b3d65f31be22ed97aceb649d4e0bd027cfbf72b. 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/UK2Y21309068.
Eugene Onegin, Op. 24, Act II Scene 1: No. 15b, Scene "Ty ne tantsuesh, Lenskiy?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde70d2404423c0755f730759a97bb15a277c6a24d1fb35af0bb41493ce030d83. 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/UK2Y21801587.
Eugene Onegin, Op. 24, Act I Scene 1: No. 3b, Olga's Arioso "Ya ne sposobna k grusti tomnoy"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad85d55b4e4489bf93c2373cb17dbb40945aa12b6b29ef7a3003c96e18f3a074. 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/UK2Y21309069.
Eugene Onegin, Op. 24, Act I Scene 1: No. 4, Scene "Nu ty, moya vostrushka"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39cd7f27c8e65530250797d83a4718948e06a1c92e9fb1e89de908ec5cef325. 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/UK2Y21309070.
Eugene Onegin, Op. 24, Act II Scene 2: No. 18a, Duel Scene "A, vot oni!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa17c2386465db406f8c8bace43b13b28e774cc8da39af0725a0881d74509c54. 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/UK2Y21801591.
Eugene Onegin, Op. 24, Act II Scene 2: No. 18b, Duel Scene "Vragi! Davno li drug ot druga?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f37bd91ae8659090fbc3f71fd19742e56e04c889683c85d959b81c21886985. 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/UK2Y21801592.
Eugene Onegin, Op. 24, Act III Scene 1: No. 19, Polonaise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9eb9cbe6c1095d61ebedbc995fc5b3cc3557b3ae6aaff9a36808050ec48b72e. 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/UK2Y21801593.
Eugene Onegin, Op. 24, Act I Scene 1: No. 7, Final Scene
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc9c0949e85ab0b17308c500f28aca73644d7ba76ed82633b9c816ba7f91893. 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/UK2Y21309075.
Eugene Onegin, Op. 24, Act III Scene 1: No. 20a, Scene "I zdes, mne skuchno!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fcfa99069fdeb7f0ab2fc6ae0b1e1309e1b88b11682f4ffcd7f48ce22bacef. 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/UK2Y21801594.
Eugene Onegin, Op. 24, Act I Scene 2: No. 9, Tatiana's Letter Scene "Puskay pogibnu ya"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758f834e676cc6a64621ee8f35ba9b39bac8ec7faa1c8c482292b2ae5fa7790d. 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/UK2Y21801576.
Eugene Onegin, Op. 24, Act I Scene 2: No. 10, Scene and Duet "Ah, noch minula, vse prosnulis"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3a825eac2a731c59c99ff2c98653b14504ac3a134f695ae5b5dbbb8f2ef7f7. 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/UK2Y21801577.
Eugene Onegin, Op. 24, Act III Scene 1: No. 20c, Scene "Knyaginya Gremina!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970189d4f696a55d93af7bb942c0d354437682a691cf82979512ac11ca6ccf2a. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/UK2Y21801596.
Eugene Onegin, Op. 24, Act III Scene 1: No. 20d, Gremin's Aria "Lyubvi vse vozrasty pokorny"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b140b2570204414e4d4c75929329707b991a258cc353789ddb25e4ae4c9fe1. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/UK2Y21801597.
Eugene Onegin, Op. 24, Act III Scene 1: No. 20e, Scene "Itak, poydem, tebya predstavlyu ya"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395590d4c0d561a67c4927816cf2566fcaff00f0309b1ce4ebd07d91d2c314e8. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/UK2Y21801598.
The Queen of Spades, Op. 68, Act III Scene 7: Herman`s Aria "Chto nasha zhizn? Igra!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec7600253138360df4ca8cacb7ece3680c377d3529039c73a4c200fbd05e1ec. 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/UK2Y21310549.
The Nutcracker, Op. 71, Act II Scene 3: Dance of Prince Orgeat and the Sugar-Plum Fairy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6399a71ed3c5f131e1d2f3ed350cd9cad9589e91ab32c3d8101fce8d55bae7de. 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/UK2Y21310538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd635e5284a415d2db4d087262c995fddb0e1d2bbc3a8badf85fdbf4b007029c. 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/UK2Y21310524.
Romeo and Juliet, Op. 64, Act I Scene 2: Dance of the Knights
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78380d187ed5ee39b5fc39295ae5cbdc03ee0ed33ef2adf876768a96d1c1a99a. 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/UK2Y21310553.
Сказка о царе Салтане: В синем небе звёзды блещут
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aefe2020b0b4e399d86b7781f1a74c3fcd390063480062958a24982bb938fb2. 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/UK2Y21315080.
Сказка о царе Салтане: У лукоморья дуб зелёный
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaae5b68d3676fcb1674387a0c2983403c0d1e601ad9f91882b281af3793eaa0c. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/UK2Y21315079.
Prokofiev: Cantata for the 20th Anniversary of the October Revolution, Op. 74 & Scythian Suite, Op. 20