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 0x4d9dfce92d0d1f654d6a942e42a159efa9dd61caafdb94cbfc60ad24ce55a0f1. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49d9a8e0-9d53-4f47-8a2f-17235b126d29.json and https://artists.proofprofile.net/proofs/artist/49d9a8e0-9d53-4f47-8a2f-17235b126d29.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Matthäus-Passion, BWV 244, Erster Teil: 11. Evangelista, Jesus, Judas "Er antwortete und sprach"
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 0xc631fefc0296cd569123a9c9f816ecbf33c347f29fd15c1e8e50a4af57d0aa17. Chain 2 (Bitcoin): anchored in block 956995 (2026-07-07T04:27:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149809110 — a six-check JSON result.
Matthäus-Passion, BWV 244, Erster Teil: 26. Evangelista, Jesus, Judas "Und er kam und fand sie aber schlafend"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a374b3784c9cf9644d6eaefc7a55c34995ccd11fa42c6323ce03f58473e4a6. 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/FRZ149809260 — a six-check JSON result.
Matthäus-Passion, BWV 244, Zweiter Teil: 33. Evangelista, Testis I & II, Pontifex "Und wiewohl viel falsche Zeugen herzutraten"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6724dcfd47d29ee027fe240c7d82b13d0109381bb3013a91dec82070e8fdc73d. 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/FRZ149810040 — a six-check JSON result.
Matthäus-Passion, BWV 244, Zweiter Teil: 36a. Evangelista, Pontifex, Jesus "Und der Hohepriester antwortete" - 36b. Chorus I & II "Er ist des Todes schuldig" - 36c. Evangelista "Da speieten s
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af51f89e4da4493604322f1f1618c4f40d3ac238205dde31e3f6187b6846049. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FRZ149810070 — a six-check JSON result.
Matthäus-Passion, BWV 244, Zweiter Teil: 41a. Evangelista, Judas "Des Morgens aber hielten alle Hohenpriester" - 41b. Chorus I & II "Was gehet uns an" - 41c. Evangelista, Pontifex I & II "Und
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f26773fa4424ddd0b4084af2627ba57e7a238cbed33bf8372d1501a182de443. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/FRZ149810120 — a six-check JSON result.
Matthäus-Passion, BWV 244, Erster Teil: No. 7, Evangelista, Judas "Da ging hin der Zwölfen einer"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e86fa73b52505292ef8911fdb811008744bb74ac77401668838ba2c86bba3d. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FRZ149809070 — a six-check JSON result.
Matthäus-Passion, BWV 244, Erster Teil: No. 11, Evangelista, Jesus, Judas "Er antwortete und sprach"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc631fefc0296cd569123a9c9f816ecbf33c347f29fd15c1e8e50a4af57d0aa17. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FRZ149809110 — a six-check JSON result.
Matthäus-Passion, BWV 244, Erster Teil: No. 26, Evangelista, Jesus, Judas "Und er kam und fand sie aber schlafend"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a374b3784c9cf9644d6eaefc7a55c34995ccd11fa42c6323ce03f58473e4a6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149809260 — a six-check JSON result.