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 0x75df9361a68ff62e54925ee18560918e1248d3a90a2b49dad501d73ad4a36de2. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a20b8cb4-5a61-43c3-a879-e1427dabc318.json and https://artists.proofprofile.net/proofs/artist/a20b8cb4-5a61-43c3-a879-e1427dabc318.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sergey Akhunov: Victor Hugo's Blank Page
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 0xa81e05d843f8b1d671f3c464819837b95396d0b748b82198c04edee98a2a4c5c. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:58:58Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD542300140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d4f7e94227e1d703fe27e8b3767907674ebdb7f3bcb081739675b80eed4285. 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/FROV62132910.
Akhunov: Cello Concerto "Actus tragicus": V. Mit Fried und Freud ich fahr dahin in Gottes Willen
Akhunov: Cello Concerto "Actus tragicus"
Akhunov: Adagio "Prayer for Peace" (String Quartet Version)
Akhunov: Choir Concerto "Exegi monumentum": III. Dicar
Akhunov: Choir Concerto "Exegi monumentum"
Akhunov: The Art of Light Touches: VI. Barcarola
Akhunov: The Art of Light Touches: II. Giga
Sergey Akhunov: Ballet Liturgy: VI. Cherubic Chant
Sergey Akhunov: Ballet Liturgy: VIII. Kyrie eleison II