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 0xa96f871883954682cdd4b9faf15da2dca96b3cb24dc4dda07a137b007b0bba4f. Chain 2 (Bitcoin): anchored in block 953955 (2026-06-16T14:29:53Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/25009d4a-c0a8-4d71-b45f-e1a078654fd6.json and https://artists.proofprofile.net/proofs/artist/25009d4a-c0a8-4d71-b45f-e1a078654fd6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vivaldi: Concerti per archi (Concertos for Solo Violins & Strings)
Concerto for 2 Cellos in G Minor, RV 531: I. 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 0x7d1d6d235936794abc2baf04e3c9c122e073fc09b7264e26b71662100c55c699. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAQ70700054.
Concerto for 2 Cellos in G Minor, RV 531: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254ac6a895e073d2e1638844fd8fb39361dd352033c550782f7eb3c15d9f5ee6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAQ70700056.
Concerto for 4 Violins in B-Flat Major, RV 553: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb7468be80a61022bd5ab2ea3346409d781e288f63da06f245ffccc8fef3638. 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/DEAQ70700051.
Concerto for 4 Violins in B-Flat Major, RV 553: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a0cf375918cd168a248199ade64f81e7170eb023f576c77e1578b230cc80d3. 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/DEAQ70700052.
Concerto for 2 Violins in A Minor, RV 522: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9490ab607523cfd06eb478525e7c8053a185436c9f8db57bc15e0a0a35010b2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAQ70700057.
Concerto for 2 Violins in A Minor, RV 522: II. Larghetto e spirituoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2a81175d5beaa68133962725a132b77d34c80f2ddc203d30cb3155706f9969. 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/DEAQ70700058.
Cello Concerto in G Major, RV 413: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aeb69bb02201b9cc8644e066ff634946c4fe9a39b60c53c4f85c6f154f1b0ee. 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/DEAQ70700061.
Concerto in B Minor, Op. 3 No. 10, RV 580: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c831542f17eba62d3687bb24016d057434f0c0f66ee526e39f6b68d56b6cf3e. 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/DEAQ70700063.
Concerto in B Minor, Op. 3 No. 10, RV 580: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5da3d5bb1a06e2560d65515e7d988a50a08464437a8b238e2afc7990feb9c5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAQ70700065.
Concerto for Strings in G Minor, RV 156: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ed9bfa8434af73ede7aca631f66c2c950d03f1561181e4aa8b14ed80b76804. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DEAQ70700066.
Concerto in B Minor, Op. 3 No. 10, RV 580: II. Largo, Larghetto, Adagio, Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4099e49a75e842bda7248c0eea54fda59a5ec3b681a18d7d1cb4c82088348a75. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAQ70700064.
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
Concerto for 3 Violins, Strings and Continuo in F Major, TWV 53:F1: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d2659b0face7ccdb89d90757c506ee8d7836a6a455519650dc4c4200abfe39. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEE477700068.
Concerto à 4 in G Major, TWV 43:G13: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4d0159c68490aa280e3972d55fb7080b60c332f55b966f0dd18cbd23a9b0f8. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DEE471700088.
Trio Sonata in E Minor, TWV 42:e7: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f4769bd1eef5e7c9a746b8aca060b055e99c17f76f5c41cda26a50b6383ec4. 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/DEE471700082.
Ein feste Burg ist unser Gott, Beckmann 25 - Vocal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4a4fe7751d236108071887c60c56ce65ce38c0df810f7570144af60b181e41. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE471700092.