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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x299c508f895276a6b969507dbfe34c0ec3691091e42c3cb39c2fe6554cde60b3. 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/de2404ff-d8fb-4a5c-a89a-a35e5f3ebfd8.json and https://artists.proofprofile.net/proofs/artist/de2404ff-d8fb-4a5c-a89a-a35e5f3ebfd8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Barbarian Beauty: Concertos for Viola da Gamba
L'arte della scordatura: Violin Works from Biber to Tartini
Violin Concerto in D Major, Jung I.7,c: III. Allegro
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f4a711e7cf06e7a2d13578bf7fd896251736e8f924cc385e61d44251434b46. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302004.
Sonata in C Minor, Jung III.2.B: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c3c75876db260a0828d24e572b3809d91362ac3f025fb58dde9e237cf6ca5d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302005.
Violin Concerto in B-Flat Major: II. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2f5d8d0988a5d76bbcc16a49d69f3c72f41dcedfab808dd0fc87aa981b05d4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2174d33808bf7b18c3705b44e39d75f8be8fb6beda72b448ac5d4599c96a5be5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302010.
Violin Concerto in E-Flat Major, Jung I.3: I. Allegro e sostenuto / non tanto Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417eec347d7544a7aa8dc0c721c93e7ef3907c9c3ac988eb98183c07aaa7670e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302011.
Violin Concerto in E-Flat Major, Jung I.3: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab6c0f3afa73fee5864d045fd32fb2714754ec4d158f96f2204722f226bd836. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302012.
Sinfonia in B-Flat Major, Jung III.1: II. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5417a5be77f51a3a299d52ad134a6465c1bf88c6ea476c073447aa9645011ac1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2131f43336eba04a5ae81bf531cf19d4b24c3f31c5f8895a54ed8438ba4703b5. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302001.
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
Violin Concerto in D Major, Jung I.7,c: I. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9182f9d7e24db7c3f1d7d4eb32289dd2a14190b23e17a9cd6b309ca925b0a1a4. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302002.
Violin Concerto in D Major, Jung I.7,c: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf428da2fcf36700a2a5d7a5114332cfeab6321875bff99fbd114b990dd134d5. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302003.
Sonata in C Minor, Jung III.2.B: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaec09baa5b13ae712442ceffb20b7dc37e821ec7a0d82ce647e117d18b5fe51. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302006.
Violin Concerto in B-Flat Major: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04050f9d96c198b4b3f8c2fbfd08e9763e0218028a393f3b02e221eb7986363. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302007.
Violin Concerto in B-Flat Major: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e419e6077118f59874024a5fc9b16d6101ae288ea9f4fa5f424cc3e0e8d349. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302009.
Violin Concerto in E-Flat Major, Jung I.3: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623fa717e19d75dd42b4a76120c4ebc752e19757dac27c086b0c71a07b095080. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302013.
Sinfonia in B-Flat Major, Jung III.1: I. Allegro di molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb89efc87acef60c429862511a726b4bb4e86f5d2c0d7a6a32f6859add8df6ea. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302014.
Sinfonia in B-Flat Major, Jung III.1: III. Tempo di Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8323cd8aed551533b1138186d15073766643b0961326562aa6d163e2898d70. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES382302016.