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 0x5d67e410d13c8fc18ed632c51b33437ebdeb1e4aedeb73de2cf6ddfe7a1724ed. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d9c60a28-ab19-46ca-8114-a95f3fcc54f2.json and https://artists.proofprofile.net/proofs/artist/d9c60a28-ab19-46ca-8114-a95f3fcc54f2.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Beethoven: Concierto No. 2 para piano y orquesta in B Major, Op. 19
Bach: Conciertos de Brandemburgo, No. 1, 2 y 4
Concierto de Brandemburgo No. 1 in F Major, BWV 1046: II. Adagio
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 0xd8db9ded8ab88cd37e3074769f8a5cc45685aeda237a0ba2ecdbb148f9bb3ebb. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/ES5337708045 — a six-check JSON result.
Concierto de Brandemburgo No. 1 in F Major, BWV 1046: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e8f946254e0968cbaff1b300df0bf168f4b4b2fab6628600d989e35fb3bf37. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/ES5337708046 — a six-check JSON result.
Concierto de Brandemburgo No. 1 in F Major, BWV 1046: IV. Menuet - Trio I - Polacca - Trio II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b57bfc695a168308f9d255d0de2ea779b1c15aa2f2e0bbcdaca7551d3241b83. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5337708047 — a six-check JSON result.
Concierto de Brandemburgo No. 2 in F Major, BWV 1047: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c63a035847cfbba5054d25d701c0bdb1a4aed44be0cd4a5eac85dce4445efe7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ES5337708048 — a six-check JSON result.
Concierto de Brandemburgo No. 2 in F Major, BWV 1047: II: Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c611384bcba45a22f17dfaa604e56816a6b5ea102c0c3121319b442b8bccb4. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5337708049 — a six-check JSON result.
Concierto de Brandemburgo No. 2 in F Major, BWV 1047: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fed9533203954531399d648b3b396a6a01f86e5c27ce7cc89010f321418e15. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5337708050 — a six-check JSON result.
Concierto de Brandemburgo No. 4 in G Major, BWV 1049: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ce2c491d4da0772c5ab215c0550041b6052fe9bf813ed59c9deb8a242a175b. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5337708051 — a six-check JSON result.
Concierto de Brandemburgo No. 4 in G Major, BWV 1049: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bec40ce25c7ea189536f5d85ccf72fd7668fc170a58baac55450256dd50f9e. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5337708052 — a six-check JSON result.
Concierto de Brandemburgo No. 4 in G Major, BWV 1049: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81870f7b059734d9103a0d087d9d4d573871dc8d679c8bfafd37e8424490ffa. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ES5337708053 — a six-check JSON result.
Beethoven: Concierto No. 5 para piano y orquesta in E-Flat Major
Bach: Conciertos de Brandemburgo No. 3, 5 y 6
Concierto de Brandenburgo No. 3 para orquestra in G Major, BWV 1048: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd6a3aa02a4583ed9ced9ce912c3a969b8601fd1bab9a0436d2efca12e02fb3. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/ES5337807571 — a six-check JSON result.
Concierto de Brandenburgo No. 5 para orquestra in D Major, BWV 1050: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7579ba411402841c17561685c15c238415b9bd945dc2262492777a2db08f0a86. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ES5337807575 — a six-check JSON result.
Concierto de Brandenburgo No. 5 para orquestra in D Major, BWV 1050: II. Affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7075ebcecc2f44d6dbb75e61654dca0909fd9c50999e98b9fd8a696640aa28. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5337807576 — a six-check JSON result.
Concierto de Brandenburgo No. 5 para orquestra in D Major, BWV 1050: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffe35ef70f73e63e941f4fc7d5d3aee8892f82233961008d4ce9f49bd7ebc4a. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/ES5337807577 — a six-check JSON result.
Concierto de Brandenburgo No. 6 para orquestra in B-Flat Major, BWV 1051: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9e9a842375b4e8a0a488c4e83d0a9f193ba988b759ecbb82eeaa35c198b33e. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/ES5337807578 — a six-check JSON result.
Concierto de Brandenburgo No. 6 para orquestra in B-Flat Major, BWV 1051: II. Adagio ma non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077748f0806e4d59978763ad4d9b55ae54b5716b68bda207391f47c6ef925edb. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/ES5337807579 — a six-check JSON result.
Concierto de Brandenburgo No. 6 para orquestra in B-Flat Major, BWV 1051: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c093be159b5a7886834561e5ac68b7eb42493e705c15b63cb952072d035dfd2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES5337807580 — a six-check JSON result.