thumb|Paul Jeanjean Paul Prudent Jeanjean (1874 – 1928) was a French composer and principal clarinetist of the Garde Republicaine Band and the Monte Carlo Casino. While known primarily for his clarine
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 0xecddb1a6d4bad9040a6584fbf8a4e2e1ba2cd8a251137e8ea5efa0c11e79d81a. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/474df18e-eb56-4973-a35b-d7e79c5d994d.json and https://artists.proofprofile.net/proofs/artist/474df18e-eb56-4973-a35b-d7e79c5d994d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
18 Etudes for the Clarinet: No. 1, Lent et expressif
Paul Jeanjean: Clarinet Chamber Music (Includes World Premiere Recordings)
Jeanjean: Vingt études progressives et mélodiques pour la clarinette, vol. 1
Jeanjean: Vingt études progressives et mélodiques pour la clarinette - 2e cahier
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 0x007ca8de2f61ed6954f34e8e6fb2b0797c61f94bee16b5026292b1d0d3f42c0e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CZA160701486.
Louis Cahuzac: L'œuvre pour la clarinette
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2968adc74c11afd500a3bf37b3ff1d5f5f09a498af1c58fc1fdc82256bd7d12. 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/FR10S1548002.