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 0x8c42a87c9898ae062e44d648ea98c49c0ad8bb9f4cfead1c72b561233c49603b. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ceee0c73-aa45-4378-b045-2f2faf06eba3.json and https://artists.proofprofile.net/proofs/artist/ceee0c73-aa45-4378-b045-2f2faf06eba3.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Great Mass in C Minor, K. 427: I. Andante Moderato (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 0x24e9fb920cf8c91f248b65a6e462ea08afba6cea4d4cea8f90945dfa1bd9655c. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/FR47Q0508320 — a six-check JSON result.
Great Mass in C Minor K 427, Gloria: Gloria in excelsis Deo (Allegro Vivace)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10cd398e1d58aef66eebff93580d77301d6aa1c1cb14a6eaa0903ae5d81fdf14. 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/FR47Q0508330 — a six-check JSON result.
Great Mass in C Minor K 427, Gloria: Laudamus te (Allegro Aperto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0085f38228ed197831d5a2c7b581b753a627f8dd99034ea20eaaa64d53417b6b. 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/FR47Q0508340 — a six-check JSON result.
Great Mass in C Minor K 427, Gloria: Gratias (Adagio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105fa782f078bffb75014bc6bda9e6423823e46d2648ec75c58db01d99e18548. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR47Q0508350 — a six-check JSON result.
Great Mass in C Minor K 427, Gloria: Domine Deus (Allegro Moderato)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9131d6a20e4025b536a5b95962e8f95e1008453e00acf3c27691642b5f158170. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR47Q0508360 — a six-check JSON result.
Great Mass in C Minor K 427, Gloria: Qui tollis (Largo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84448f57ed483d9e36e891c1c15152cdef7409c805abe7431815c532ad604a6d. 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/FR47Q0508370 — a six-check JSON result.
Great Mass in C Minor K 427, Gloria: Quoniam tu solus (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0741e7405408104693a94f6daccc548d4cf5500148d9c817c859746e28f458. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/FR47Q0508380 — a six-check JSON result.
Great Mass in C Minor K 427, Gloria: Jesu Christe (Adagio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba858cedfb52b46963139df7a7c263eb683da285101da486b165e1e68d4ec7a. 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/FR47Q0508390 — a six-check JSON result.
Great Mass in C Minor K. 427: IX. Cum Sancto spiritu (Gloria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d06192af5d29ad5552b7d2b9877b767774d102af4f720f41742f5b690322bfd. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/FR47Q0508400 — a six-check JSON result.
Great Mass in C Minor K 427, Credo: Allegro Maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9812c5efdb0e2a0bc4f551f9d007c6816f8a9defa2d24a70f6f45d926a352806. 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/FR47Q0508410 — a six-check JSON result.
Great Mass in C Minor K 427, Credo: Et incarnatus est
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76f1a31ac69ad41cf51b8b6c8abd1b416f86f39145bbd19c1b74d3f7e56f79e. 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/FR47Q0508420 — a six-check JSON result.
Great Mass in C Minor K 427, Sanctus: Sanctus (Largo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc66af24d6b2bd563eea1f1a11ac8733e3a8f1f5c6586bf5d61a2681eae2b98c. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/FR47Q0508430 — a six-check JSON result.
Great Mass in C Minor K 427, Sanctus: Benedictus (Allegro Comodo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782bc975bab6375a40f59810aca2ecae82f9da1c9ff69a5bcda89a10d7261c33. 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/FR47Q0508440 — a six-check JSON result.