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 0xcd9f1ffd93660a60435014089fdee7d6a2ddbdc70f8046dbc40a37356589987a. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/031d4d43-6ad5-4937-bc85-2186a7724ff3.json and https://artists.proofprofile.net/proofs/artist/031d4d43-6ad5-4937-bc85-2186a7724ff3.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, 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.
The Queen of Spades, Op. 68, Act II Scene 3: Scene and Yeletsky's Aria "Hozyain prosit"
Tchaikovsky: The Queen of Spades, Op. 68
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a7ed861309b53b469ced57151feb4d1c3f0d2840c2f474b0defb46b01d4e1a. 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/UK2Y21800872.
The Queen of Spades, Op. 68, Act II Scene 3: Scene "Posle predstavleniya zhdite menya v zale"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5610e2e2c7491c50a445bacf174ae81605de33920440b9597e021e6901385ae9. 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/UK2Y21800875.
The Queen of Spades, Op. 68, Act II Scene 3: Final Scene "Kto pylko i strastno lyubya"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4073c967ae0aabaed556a89a4bca7d00b105e24cddbd9310d7d01e11e79d2923. 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/UK2Y21800880.
Prince Igor, Act I Scene 1: Chorus "Goy! Slava! Slava Volodimiru"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734024137ebba1e812310344678184ae3aecdee60b260a3d96cc3cccc32cd78f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21602942.
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
Prince Igor, Act I Scene 1: Chorus and Scene "Oy, likhonko!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa764a0d47f59a3f1126478be74cc6fc101d158e2fcdaeb5e1c63f348056a9fc0. 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/UK2Y21602945.
Prince Igor, Act I Scene 1: "Chto u knyazya da Volodimira"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68774949825bae90f21ad049586d3f4ed16ed3f4f5f60d4502c1645132fc000. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/UK2Y21602947.
Prince Igor, Act I Scene 1: "Da, vot komu by knyazhit na Putivle!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908fa573088265047e6060d99342adc0dbd1d68f172c87c33f5bd02ac407dc2a. 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/UK2Y21602948.
The Queen of Spades, Op. 68, Act I Scene 1: Scene and Herman's Arioso "Chem konchilas vchera igra?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38c55692290084b2b19aae7f8018799a2b41561daf30f98c12b0a6f934a0698. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UK2Y21800849.
The Queen of Spades, Op. 68, Act I Scene 1: Scene and Tomsky's Ballade "Kakaya vedma eta Grafinya"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef9bfc22cb02ceea9f717f6ac2cdd83d731e8efc55c3f5d692aae600c2e2ea5. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/UK2Y21800856.
The Queen of Spades, Op. 68, Act I Scene 1: Final Scene "Se non e vero"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5ab82e408170983410e488bdaa5237190e6cb282cb61ca9523c547356b05e2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/UK2Y21800858.