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 0x1a4e3c721b7fa4f04b84025a01a39ffb8b9bcba248a21325d8d69d27a8cc2eac. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f54b7909-36f6-4f78-a9eb-9b3d5de87341.json and https://artists.proofprofile.net/proofs/artist/f54b7909-36f6-4f78-a9eb-9b3d5de87341.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Toldra, E.: 6 Sonets / Turina, J.: El poema de una sanluquena, Op. 28
12 Concertos, Op. 3 - "L'estro Armonico" / Concerto No. 10 In B Minor For 4 Violins And Cello: Allegro
Vivaldi: The Four Seasons; Concertos for 3 & 4 violins
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 0x5579ba9b17478cb1945ece252919da5da155874d64aeffd63b7261b05db61761. 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/NLA508720714 — a six-check JSON result.
12 Concertos, Op. 3 - "L'estro Armonico" / Concerto No. 10 In B Minor For 4 Violins And Cello: Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d86cbc8a19fc390fae6eb6aede7cba8630e7229fa263e82575c45a5c3c8a14. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/NLA508720715 — a six-check JSON result.
12 Concertos, Op. 3 - "L'estro Armonico" / Concerto No. 10 In B Minor For 4 Violins And Cello: Larghetto - Largo - 3. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8249ec366a8e9055260b4b227db9018844931c1cc94497b5b62c2d5d5d52d1f. 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/NLA508720716 — a six-check JSON result.
Messes des paroisses avant Vatican II : A la campagne, à la ville
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x617703a934a11bd5849b71e752d3ab53370528b8c1ecbd65ab54c9f93691e7fe. 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/FRZ177201090 — a six-check JSON result.
Choral, BWV 732 : Messe à la campagne "Lobt Gott, Ihr Christen, Allzugleich"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ec0197bd1dbfe7078ba92487c1c6f507735d0e6842f816f3e9cf6336c3223b. 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/FRZ177201100 — a six-check JSON result.
Messe No.8, dite des anges : Messe à la campagne ''Kyrie''
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed69d7fa6ccdb80509e758f15d3307bf6e34783fd7f3c48ddfc680ca2a880bc. 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/FRZ177201110 — a six-check JSON result.
Messe No.8 : Messe à la campagne "Gloria"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853f1a1d1db0244819a65b2e82bf84ca18d378598f8fff1a3f30a702babbfa5b. 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/FRZ177201120 — a six-check JSON result.
Messe No.8 : Messe à la campagne "Alleluia"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7670c0cd7ffe56faf40d7f1aaf6b4d6b418e4a2e25a2084d38ad57769ee0da. 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/FRZ177201130 — a six-check JSON result.
Messe No.8 : Messe à la campagne "Evangile"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62bad7c95f6ad51f69e5efc0b02a572320e6e702c26bad4fdde50ac94688242. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/FRZ177201140 — a six-check JSON result.
Messe No.8 : Messe à la campagne "Credo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb204aa42c071f578613d5fa4b79d16333bff861f8f89c379ab86d36f873ec00. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FRZ177201150 — a six-check JSON result.
Messe No.8 : Messe à la campagne, préface
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bedec3677a04e30566506c901949405e3a8f41dad22aad8416d6e42ed07ea7a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FRZ177201160 — a six-check JSON result.
Messe No.8 : Messe à la campagne "Sanctus"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd18ccae384ed271671455198c17d0350ebf215f90cf279be9d7edd69a4294e. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/FRZ177201170 — a six-check JSON result.
Messe No.8 : Messe à la campagne "Pater Noster"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa1a91bed1b06fdc554d4e4cbd2df261063b6043694c3b9a58a8d436f876922. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FRZ177201180 — a six-check JSON result.