Philippe Hirschhorn (11 June 1946, Riga – 26 November 1996, Brussels) was a Soviet violinist. He won the Queen Elisabeth Music Competition in 1967. A citizen of the Soviet Union, he was born in Riga,
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 0x4c115a3f9effe4d89cc24c3eee0516d42609bcb7e6ae62f131db4897823e0b77. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/afedef05-6e0d-4e5b-a581-57b7881ff1ac.json and https://artists.proofprofile.net/proofs/artist/afedef05-6e0d-4e5b-a581-57b7881ff1ac.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Philippe Hirschhorn (1st Prize Queen Elisabeth International Competition 1967) [Live]
Sonate pour piano et violon in G Major, V. 64: I. Très modéré - Vif et passioné
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 0xa160f12fc17b6fa30dc6048197a1d716443bb9dd0ed34222c96ab51ba8380bb9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER189110401 — a six-check JSON result.
Sonate pour piano et violon in G Major, V. 64: II. Très lent
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d5353a2d90f5ebd2a38a46eee697e90613b74476c6e3832a46236c15a81cd0. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER189110402 — a six-check JSON result.