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 0x9bfcf0fb4ec11ec7feb3ebfac390322479cbfb968243df5aa7a55ba2e4625a4a. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a396536-5548-4029-ab5f-5dafec481f18.json and https://artists.proofprofile.net/proofs/artist/1a396536-5548-4029-ab5f-5dafec481f18.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mozart, W.A.:Cosi fan tutte K.588 - Highlights
Così fan tutte ossia La scuola degli amanti, K.588 / Act 1: Ouverture
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 0xe65468dd4b0f93aded770d7fbd17ae54d65c54c62df3bc0acbb9e2f2a7b05aaf. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059231701 — a six-check JSON result.
Giulio Cesare in Egitto, HWV 17, Act I: Ouverture
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf5cf888a1a5b91be1777f9cefffdafd2c3ce0d1883130e48f3d7badf701ec6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1758847 — a six-check JSON result.
Giulio Cesare in Egitto, HWV 17, Act I, Scene 3: Empio, dirò, tu sei, togliti (Cesare)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d780aebd2c8a4e66cb29fa4d516e274219a9dae7677174cd8e538f0d1146d7. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1758852 — a six-check JSON result.
Giulio Cesare in Egitto, HWV 17, Act I, Scene 4: Svegliatevi nel core, furie d'un alma offesa (Aria) (Sesto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e12b43992e5df71dcb30bfa3f80c99e05a84b780f663f78a932ebbfc52ed60. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1758856 — a six-check JSON result.
Giulio Cesare in Egitto, HWV 17, Act I, Scene 5: Non disperar; chi sa? Se al regno (Cleopatra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52dc506ba717a48b96cf19380262ce603129b665eaa2e7671538fcc4acc162db. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1758858 — a six-check JSON result.
Giulio Cesare in Egitto, HWV 17, Act I, Scene 9: Vatacito e nascosto (Aria) (Cesare)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e20ae3b56cada108721c1fc6b6c43dc0e5d3f69d96073beeaf19dbd98be573d. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/FR10S1758873 — a six-check JSON result.
Die Zauberflöte, ZWEITER AUFZUG, Nr.10 Aria & Dialog: Aria con coro: O Isis und Osiris ... (Sarastro/Priester)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3377f10828dc2b1aec9a1f92581865a7b0779dfe408c94695afe4f2798adb11c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9001019 — a six-check JSON result.
Mozart: Die Zauberflöte, K. 620, Act 1 Scene 1: No. 1, Introduction, "Zu Hilfe! Zu Hilfe!" (Tamino, Drei Damen)
Sir Roger Norrington/London Classical Players/Anthony Rolfe Johnson/Andreas Schmidt/Dawn Upshaw/Guy de Mey/Beverley Hoch/Olaf Bär/Catherine Denley/Catherine Pierard/Cornelius Hauptmann/Nancy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa57d70b984e2a2e0950787b0940dd8bb3221ece73b990cdc88588d253af09769. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9000984 — a six-check JSON result.
Mozart: Die Zauberflöte, K. 620, Act 1 Scene 1: "Ich sollte fort! Ei ei! wie fein!" (Drei Damen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b55570ecdd30e5215e3ca0a6701029299f78f2a106c8f28a413c4daa744e01e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9000985 — a six-check JSON result.
Mozart: Die Zauberflöte, K. 620, Act 1 Scene 3: Dialog, "Papageno! … Wer sind diese Damen?" (Drei Damen, Papageno, Tamino)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b0078a7f97f66bb15e1dff6cb64bb74d2dd103d6d67e429db76b4c3276bb25. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9000991 — a six-check JSON result.
Mozart: Die Zauberflöte, K. 620, Act 1 Scene 7: No. 5, Quintett, "Hm! hm! hm! hm!" (Papageno, Tamino, Drei Damen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5ebb775f97a8f03de273de98ef8c44f3d9d9941e317ec74cb199cae37ddf78. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GBAYC9000999 — a six-check JSON result.
Mozart: Die Zauberflöte, K. 620, Act 1 Scene 5: Dialog, "Rüste dich mit Mut und Standhaftigkeit … Sie kommt!" (Drei Damen, Tamino)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4e642c30e61c71590640494673b0ee310a10ac884a06dc64f455317fa44412. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9000994 — a six-check JSON result.
Mozart: Die Zauberflöte, K. 620, Act 2 Scene 5: No. 12, Quintett, "Wie? Wie? Wie?" (Drei Damen, Papageno, Tamino, Die Eingeweihten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be8dcecca5d099ca365bff3d55f027e0064963d6464c45bd02df4570eb90126. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9001025 — a six-check JSON result.