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 0xdd63027b56e1483c2231a18ddb07a4ad5c35d312558b008486c94fd9ce072190. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5aca05e2-a19d-4ccc-ac1d-15bfa2240bf8.json and https://artists.proofprofile.net/proofs/artist/5aca05e2-a19d-4ccc-ac1d-15bfa2240bf8.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, Act I Scene 2: Yaroslavna and Maidens Scene "Tam devushki prishli"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bdd85fb3e3f2643c81b6f03971c1f0e61fc2bb1c0f851041c75b97169a3d21e. 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/UK2Y21602950.
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
Rimsky-Korsakov: Complete Operas & Fragments
Grand Symphony Orchestra of All-Union National Radio Service and Central Television Networks
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c56e9b32eae0a57730ece8da718345a14948f99fd031dd0bd03e1266cdc2149. 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/UK2Y21303558.