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 0x6a3e7bafb883e4546801d698864c1c61e4094e30514d30a2e6aeaffbda7b1016. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a25bb20c-1b8a-4b94-8061-73a96e13df5d.json and https://artists.proofprofile.net/proofs/artist/a25bb20c-1b8a-4b94-8061-73a96e13df5d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mass in C minor, K.427 "Grosse Messe" - Edited Maunder.: Kyrie
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 0x25d70843827af18e0cae87aa1b4c1b49abde2ac2de6535567340ca33637cd9c5. 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/GBF078841801 — a six-check JSON result.
Mass in C minor, K.427 "Grosse Messe" - Edited Maunder.: Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8958686886dcd11b2a723b7ed927cbb5af6fe980902ccd1af827b8e3ef94dc91. 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/GBF078841802 — a six-check JSON result.
Mass in C minor, K.427 "Grosse Messe" - Edited Maunder.: Gratias
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1209060c62cacb98f89fb8856fda462d5428a6222f958696085aff00f19f01d0. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF078841804 — a six-check JSON result.
Mass in C minor, K.427 "Grosse Messe" - Edited Maunder.: Qui tollis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d8636736b5a73f2f31a1bdd25dea8cd1f1532274207f6c35b09eb421d9fa23. 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/GBF078841806 — a six-check JSON result.
Mass in C minor, K.427 "Grosse Messe" - Edited Maunder.: Jesu Christe-Cum Sancto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4114ed5dc515f5a9833873271da240336cfb94ff32cd0ce0ac183139ab2c39ec. 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/GBF078841808 — a six-check JSON result.
Mass in C minor, K.427 "Grosse Messe" - Edited Maunder.: Credo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fd73c5823b54b4549f5c1dc6bf65a1457e4153867eb2dfe34b299af1e0d18e. 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/GBF078841809 — a six-check JSON result.
Mass in C minor, K.427 "Grosse Messe" - Edited Maunder.: Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99cb9d9c8a8d78e8fdfd891318f7e1fb766af51021878f4545cd8eed78ab55f2. 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/GBF078841811 — a six-check JSON result.
Vesperae solennes de confessore in C, K.339: 5. Laudate Dominum omnes gentes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe477b518fc35c89d25d40bf4c43ac267c539ac8893fcc01730255cf1931a7fa5. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBF079011085 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe477b518fc35c89d25d40bf4c43ac267c539ac8893fcc01730255cf1931a7fa5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBF079011085 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe477b518fc35c89d25d40bf4c43ac267c539ac8893fcc01730255cf1931a7fa5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079011085 — a six-check JSON result.
Mozart: Coronation Mass; Vesperae solennes de confessore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f0590045de47db6f72fe581c2e6aa934ec264986088c3780b61fa703ff8438. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/GBF079011071 — a six-check JSON result.
Mass in C, K.317 "Coronation": 2. Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad120c909554571ead9c2ad96551d82b7a65e5c88a68a824bba301b4373e162. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079011072 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9cfe832b425aa3627bbfb570933cde0e308b99063d5ee0a5247de45ffbefe1c. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079011074 — a six-check JSON result.
Mass in C, K.317 "Coronation": 4. Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc553eacaa97547b23e8a3b37cd8e75f254ec7daf2ff2a02e6b3a3a1605703366. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079011075 — a six-check JSON result.
Mass in C, K.317 "Coronation": 5. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160bbffe923f87cdfc559910893e7fb39a884174c38508b9f7cc18a1eedd9322. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/GBF079011076 — a six-check JSON result.