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 0x67e525f5296c20aca6e97d3474b344482fa4c27bab4b1d8623f747fece7712da. 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/e0448123-a9de-4647-885a-a29ce9a6721b.json and https://artists.proofprofile.net/proofs/artist/e0448123-a9de-4647-885a-a29ce9a6721b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
J. Desprez: Missas l'homme armé - Desprez Recordings, Vol. 6
J. Desprez: Missa pange lingua & Motets - Desprez Recordings, Vol. 5
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 0x82b13c07216c832074b059c4800f264632c76e1a00387fcb34324209eab83776. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRZ139900060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc1918f056ed13f8805d2048062f24043e119b9746c0be543b7749d4e8dbd9b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRZ139900340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0959b65b2ee97b5fc44f6aa249add7cba7054e660e7937d1f2c4ad20ab1b2ec8. 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/FRZ139900350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6707074622a3adb5eb4d270dcb6bc4e6e41f95481bb82c86498bff803c7c06ef. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/FRZ139900360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0554141f6582ef8a2faee3806c5900bf1b7cd4cf73a02727d085ec6b2f493904. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FRZ139900380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29358223832303803415d3d2cb26fdec50a3a5c37a200d08fb92e89dd5776251. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FRZ139900400.
J. Desprez: Missa Gaudeamus & Motets à la Vierge - Desprez Recordings, Vol. 4
Missa Gaudeamus: V. Agnus Dei: No. 2, Agnus Dei, qui tollis peccata mundi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65cf6c0955ae872f7e20dda414ec787ece8b78c69852ae85f8cf9632982ba53d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ139700119.
Motets à la Vierge: Recordare virgo mater: I. Prima pars
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880f89c05b0fbbe4b037e9b17f4f92f339dad48e83693ad5bc92c8eafd3469ff. 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/FRZ139700141.
Motets à la Vierge: Ave maris stella: I. Prima pars
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135989acc183498bedef0f267c96cb1e8b5b729f2430ab068104680aeb627c90. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/FRZ139700161.
Motets à la Vierge: Ave maris stella: II. Secunda pars
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2243f5d86e64bf4c66a08d915fb7ffa104aeb1f3eb7d58e7056f646a0125d7. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/FRZ139700162.
La musique au temps des castrats - Astrée Recordings
Orfeo ed Euridice, Wq. 30, Act II, Scene 2: Symphonie - Arioso "Che puro ciel, che chiaro sol" (Orfeo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa693f78ab43fd53a25b01e130c41c63044b257f358459b821e18a9e501b067. 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/FRZ130893010.
Motezuma, RV 723, Act III, Scene 10: Aria "Dov'è la figlia" (Motezuma)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077f7fb8d77bc387b359ff0bdca25c6cc16e01ac27ace5b7e9d64bf6ed783843. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/FRZ130893020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23005035b1397856e476d2fe2f006e353388ce5c3c122a1ff373bd0d14a6b3d. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FRZ130893030.
Dixit Dominus, RV 594: No. 8, Aria "De torrente in via"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570aa494a834cae3d1fc144694c9c4929beebb949399c044b313680572fb0b94. 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/FRZ130893040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0311c0c808039c896b1e76b2b48d43de62d6d86e38f39c7810f812e2b2542b1a. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/FRZ130893050.
Orfeo ed Euridice, Wq. 30, Act III, Scene 1: "Che faro senza Euridice ?" (Orfeo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf857df1afec9af21ea6f15745ea585f44dad58d45fdd7f5ac32ff189510020d2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRZ130893060.
Motezuma, RV 723, Act I, Scene 2: Aria "Gl'oltraggidella sorte" (Motezuma)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd90144e6a56545efc38a0b397218a66eb9055daf779b2f2ff85fe7c5fb96962. 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/FRZ130893070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88325b77a2a3ac1b84f73cf18d2de63f2511d1421596dbdb71347299e357fd96. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/FRZ130893080.
Nisi Dominus, RV 608: No. 9, Aria "Sicut erat" - "Amen"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24103996fe146ad56a5ff09d79160e7e806a41aabddd23160c8e5faa0bed9462. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/FRZ130893090.
Artaserse, Act III, Scene 1: Aria "Son qual nave ch'agitata" (Arbace)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71c92936bb72dacbf6c09273bd241e818e2ac07d23d4bf15a9c184f4e8b7f31. 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/FRZ130893100.
Adagio for Strings, Op. 11 No. 2 (From Platoon & Elephant Man)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526f46062944c3b4e5540cc2dfb83525a84cd386fbdd51f4b6a07b2546cc7f7e. 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/FRZ130770150.
Melodia for Guitar 'Romance (From Jeux interdits)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8aec9e9f71c7a126e1c1ddcfcae77c1eca442697afdc4e812534e3b706092eb. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FRZ130770190.