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 0xd3e0db719a6845f3972f52dfbaabb968c33b2f8c0e635c0d228ff272e267a6df. 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/bf107475-8c93-4307-8148-f638b9bc9468.json and https://artists.proofprofile.net/proofs/artist/bf107475-8c93-4307-8148-f638b9bc9468.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Trio Sonata in D Minor, Op. 4, No. 1: I. 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 0x0ac3f38489c51ff02045d84db4e6dcbf9a70e35d83939a4f6e9f49f78754494b. 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/FR50X2299901 — a six-check JSON result.
Trio Sonata in D Minor, Op. 4, No. 1: II. Allegro ma non tropo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5958d8719ca4971dc63402989ebc3718acede52b9bfc92aee27f5b33a3ccbc6. 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/FR50X2299902 — a six-check JSON result.
Trio Sonata in D Minor, Op. 4, No. 1: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597a9bcc0953e15ad956fd6b94c16e5992ed47dc398221bd187f86ecbfcc3f2d. 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/FR50X2299903 — a six-check JSON result.
Trio Sonata in D Minor, Op. 4, No. 1: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7882c9e81ecb4944479666f5d8fd023e9cf2778ea410d1c08b1e2b84e688d1c3. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/FR50X2299904 — a six-check JSON result.
Sonata No.6 in D Major, Op. 50: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b493c13241a1c684a5e76525048981a31b22081cc2dbc3cca0ee4284d121a4e. 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/FR50X2299905 — a six-check JSON result.
Sonata No.6 in D Major, Op. 50: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ed094c976748107bf409ed54c6a088737e9d43bd5b6159650309d88f58bfeb. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR50X2299906 — a six-check JSON result.
Sonata No.6 in D Major, Op. 50: III. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c26272b4c79f74694c7d97a969bb94c7b61a23b3639c5ccfd8a5bc0b6778f1. 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/FR50X2299907 — a six-check JSON result.
Sonata No.6 in D Major, Op. 50: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a62d1b422962e567a4afa6d5fae5667c10d47518a76128db14f96bd4bb698e. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/FR50X2299908 — a six-check JSON result.
Trio Sonata in B Minor, Op. 3, No. 3: I. Prélude, Lentement
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa8bce5b9b53445de752714efd5709c1b70458d3ad37cab34e175332d1e62de. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR50X2299909 — a six-check JSON result.
Trio Sonata in B Minor, Op. 3, No. 3: II. Fugue, Gai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a43ed85514e6ee58b9f2a1fd560c9c7fc58a294f32ea6a8d6c3c7bf267a857. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X2299910 — a six-check JSON result.
Trio Sonata in B Minor, Op. 3, No. 3: III. Lentement et Doux
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962d6a54813bd057a1a8a96957c35a4a1b7a24e3a6f5a32b98ab29b49c866836. 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/FR50X2299911 — a six-check JSON result.
Trio Sonata in B Minor, Op. 3, No. 3: IV. Chaconne Gracieuse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9abdfdee3b0c50a7f768af232be4d5581109e69eedaef305a906a03400974305. 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/FR50X2299912 — a six-check JSON result.
12 Violin Sonatas, Sonata in E Minor, No. 4: I. Gracieusement
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70c2fb0f3dba927b08eea8b6a00cb73d37c5f3167328b410afd40bcc3d0262a. 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/FR50X2299913 — a six-check JSON result.
12 Violin Sonatas, Sonata in E Minor, No. 4: II. Viste
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd503538ce066f6397e952e9a6018e989374b88da623fe47cceae45d4f5cb47a8. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FR50X2299914 — a six-check JSON result.
12 Violin Sonatas, Sonata in E Minor, No. 4: III. Récit - Gai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd047e92c2a0a1f64bedb1922ec649d86f5aee9e561e9de41d76cb966d116c5. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/FR50X2299915 — a six-check JSON result.
12 Violin Sonatas, Sonata in E Minor, No. 4: IV. Viste
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2b350013159c1ceead59a4e1ac55eb5b2a3fe357a494200d5c9608261a9f83. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/FR50X2299916 — a six-check JSON result.
12 Violin Sonatas, Livre 2, Sonata 12 in E Major: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d429177ae07ac7f3fed6632e3eb915c538abfef9192ac06fc35f0911e41a00. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FR50X2299917 — a six-check JSON result.
12 Violin Sonatas, Livre 2, Sonata 12 in E Major: II. Courente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd72fcc33948aadf2bb76f8c48ec1ab5297f2fd40a88ecfe3995a13a899b3fef. 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/FR50X2299918 — a six-check JSON result.
12 Violin Sonatas, Livre 2, Sonata 12 in E Major: III. Sicilienne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6726e2094e6fbff3e7101c589d0856cbd1dfbfbb98021ddfad0a5e47b3dd0685. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR50X2299919 — a six-check JSON result.
12 Violin Sonatas, Livre 2, Sonata 12 in E Major: IV. Rondeau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a5b1fd3614b9bb438934dec2783da1a14929e5a215f56704d910d47b16e0f5. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/FR50X2299920 — a six-check JSON result.
Ouvertures and Trio Sonatas, Op. 13, Sonata No. 2 in B Minor: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d05633c130a846f15a1a08689585d3f044da5efe7c8421191324774f159d0a. 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/FR50X2299921 — a six-check JSON result.
Ouvertures and Trio Sonatas, Op. 13, Sonata No. 2 in B Minor: II. Allegro ma non tropo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ef1af53efaed1d6fbf31caed4067b04392da526f72c8f4fa9f98b6f40e0b63. 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/FR50X2299922 — a six-check JSON result.
Ouvertures and Trio Sonatas, Op. 13, Sonata No. 2 in B Minor: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d922f0dfdbc3ff756086e222728520536b361add27e320b442ed936bc4b16c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR50X2299923 — a six-check JSON result.
Rosenmüller: Sonate à 2, 3, 4 è 5 stromenti da arco & altri
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd04c1da34a6f9fbe81291af6c9ff94eec75257424a749a323c17302d2efed3f. 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/CAJ721366001 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db5ddee15e7e14b6d68ae2dda4e27fe089be2bf3665723ecb5edbc3f07b5e9c. 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/CAJ721366002 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa06ddf2302f5223a196c3d377572957386b7b041cd59bc96374fbc85981992. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ721366003 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054aa603358ec36b5993605c45ad9b29bf0dfc244f4521ef9594d11672c763ce. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ721366004 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0cc348eaf86f5acfd86277706b68edcb43c597d87beefecfec0119b481f09a. 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/CAJ721366005 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553618319cc4801638e5f9119c0210691cbd6b961ecb758f79129489edf4f15f. 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/CAJ721366006 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41df420a806f27854a7d0ad4e894a69325270ffc01ca23e7f4b8888a8809f18b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ721366007 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb306639162eb4c56cc04d63c391f86c7ab64b1c90ab7dd121c3a8791e0e5babe. 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/CAJ721366008 — a six-check JSON result.