thumb|upright=1.35|Sauguet (fourth right), with Mstislav Rostropovich (fourth left), in the Grand Hall of the Moscow Conservatory, 1964 Henri-Pierre Sauguet-Poupard (18 May 1901 – 22 June 1989) was a
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 0xfdf307642d308d224233b89ee34012307f45bd81fe12d4582e3969369f82a1f7. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/adb6e65e-9571-4cec-8d40-1b29f47d4515.json and https://artists.proofprofile.net/proofs/artist/adb6e65e-9571-4cec-8d40-1b29f47d4515.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sauguet : L'Oiseau a vu tout cela, Garden concerto, Sonate d'église
Sauguet: Tableaux de Paris: III. Quai aux fleurs, marché aux oiseaux
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 0x44cd5a931d57461ddb1ec1aa2594faf59ea36907b130f105c5ac1b81a6501ece. 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/FRZ117700630.
Sauguet: Tableaux de Paris, Suite pour orchestre: Quai aux fleurs, marché aux oiseaux
Klassische Musik zum Frühling. Vogel-Konzert
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44cd5a931d57461ddb1ec1aa2594faf59ea36907b130f105c5ac1b81a6501ece. 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/FRZ117700630.