thumb|upright=1.1|Portrait of Daniel Auber, 1827, by Hortense Haudebourt-Lescot|alt=middle-aged white man, clean-shaven except for sideboards, in mid-19th-century dress Daniel-François-Esprit Auber (
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 0x8438c36e3273d3913117c688d2b9d43dcb0a2ec7f8cb1897849a4103e8c49d7d. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f02bf36a-9b16-4f23-ad29-61479ad088f0.json and https://artists.proofprofile.net/proofs/artist/f02bf36a-9b16-4f23-ad29-61479ad088f0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Don Juan: IV. Divertissement No. 2 (After Mozart's K. 421)
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 0x75912ef54fe8b864013f3734e3c79938a79f44e98c19f9b5a7f35df2dd3e71a0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKI192333907.
Great Voices of the Century, Richard Tauber
Auber: Fra diavolo (Sung in Russian) [Live]
The Australian Ballet - The Music of the Dance: Celebrating 50 Years
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb53c433654f79e2167cc3193c6f8059329fee9cc06eab5cad123cf79d407c68. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/AUAB01250343.
Grand Pas Classique: Variation for the Male Dancer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6f14ffa0aceb40d4377388eb23c7438116164efa5547a9979ed77c15121e8c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/AUAB01250342.
Auber: La muette de Portici: "Spectacle affreux" (Masaniello)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c835c11e48151b38ab66934fc107746d93a26fd0999225224a4099d8713dd3. 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/GBPFW2300325.
Le Domino noir / Act 2: La belle Inès fait florès
La Prima Donna: Sumi Jo 30th Debut Anniversary
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd75887f0e6a49c571b2822e5bee6ace3f7114373b95f0e3458bd1ff3d419e16. 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/GBF079342218.
La fiancée du roi de Garbe, S. 49 (Excerpts): Act III Mélodrame
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3389ca2b8b509174255798da064382d6d7d9896564f27f611ee09c01cea41925. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/HKI192016512.
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