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 0x9a8e2f800b9aa7df27f0b018c27ce277bf9e51e784c087b5c636ce5050f005a8. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e565ea88-435b-4ed1-80b4-05835793a8af.json and https://artists.proofprofile.net/proofs/artist/e565ea88-435b-4ed1-80b4-05835793a8af.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mozart: Great Mass in C Minor, K. 427: VII. Quoniam
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 0x7fba7b633a81d940e3e398de331780d94fb169d856b6f4203d38ee8825e16fb7. 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/GBAYC0600731 — a six-check JSON result.
Mozart: Mass in C Minor, K. 427, "Great Mass" (Revision Louis Langrée): Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda48b8532a48d65cdeab14d1a6ced5686f6c11ee55bd9473d3ac3151b323e1a3. 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/GBAYC0600726 — a six-check JSON result.
Mozart: Mass in C Minor, K. 427, "Great Mass": Gratias
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b62e88cdf5fb4e73e61f8d399246183662ac7d648d69b7cf2b5a9ef4396dda. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/GBAYC0600728 — a six-check JSON result.
Mozart: Mass in C Minor, K. 427, "Great Mass": Qui tollis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17513b26bd84f9e9c519f964be176cce723153e8ccf4240bd9e3a2b0e421cf91. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/GBAYC0600730 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fba7b633a81d940e3e398de331780d94fb169d856b6f4203d38ee8825e16fb7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0600731 — a six-check JSON result.
Mozart: Mass in C Minor, K. 427, "Great Mass": Jesu Christe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775c1677a27205328dde7e1cf731cfdfdfa0a7363398f45375ba9e80210d30c2. 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/GBAYC0600732 — a six-check JSON result.
Mozart: Mass in C Minor, K. 427, "Great Mass": Cum Sancto Spiritu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e30e7e881bb895798da3290fe4c7f90f86948aad277500d76edb62fad429ef. 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/GBAYC0600733 — a six-check JSON result.
Mozart: Mass in C Minor, K. 427, "Great Mass": Credo in unum Deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81dd0710f64108ca044b2196cbb57bf695e5a348eba74b7c300ac3e20ec51eb9. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0600735 — a six-check JSON result.
Mozart: Mass in C Minor, K. 427, "Great Mass": Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x773f226e7308aa1e59120c4560fe4913775845c3dca6ca5baa709e207cd3b2f4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0600737 — a six-check JSON result.
Bach, JS: Magnificat in D Major, BWV 243: I. Chorus. "Magnificat anima mea Dominum"
Handel: Dixit Dominus & Bach: Magnificat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdc6c3c70728d7b0986eada3edbedcc8ee9fca760c53b3305666dbcb010c50a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0701956 — a six-check JSON result.
Bach, JS: Magnificat in D Major, BWV 243: IV. Chorus. "Omnes generationes"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e9d117f367b3a37fc41e0112b5314b35b22820f001a07dd269007760c52de1. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBAYC0701959 — a six-check JSON result.
Bach, JS: Magnificat in D Major, BWV 243: VII. Chorus. "Fecit potentiam in brachio suo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557119d7dbbec722594d2e03ed910814c62513ec94a9540e8e26e8852ef14c93. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBAYC0701962 — a six-check JSON result.
Bach, JS: Magnificat in D Major, BWV 243: XI. Chorus. "Sicut locutus est ad patres nostros"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bfe0e6ae434f681deca2254c2a8d7738fb3cb54c1d5dd3c2aed697e0d8826b1. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/GBAYC0701966 — a six-check JSON result.
Bach, JS: Magnificat in D Major, BWV 243: XII. Chorus. "Gloria Patri, gloria filio"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e4ef81681e095af08fdc9f666de5c016dd372c3b7bad412f7e2092a96365a7. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0701967 — a six-check JSON result.