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 0xdb355235d37c796a18fdb2de529a015b37b154d8f41d29abbc99ab43e5926ab0. 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/c5dfabc9-af68-424f-b57d-1f2d2115f1f3.json and https://artists.proofprofile.net/proofs/artist/c5dfabc9-af68-424f-b57d-1f2d2115f1f3.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Trojan: A Midsummer Night's Dream, The Emperor's Nightingale
The Emperor's Nightingale: V. Nighhtingale's Concert
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 0x3c4c6d11bc2f4415f75a023b5866cf4919c738552763f8352970717cbae30355. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA167806337 — a six-check JSON result.
The Emperor's Nightingale: VIII. Kolem hřbitova
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f4f264438074eabc67fc52fd51a0e937408b66d493263b14777ac08968591a. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA167809337 — a six-check JSON result.
Dvořák: Serenade for Strings, Czech Suite
Serenade for Strings in E Major, Op. 22, B. 52: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede5fb243264ea1a6541f5078393390da7805e093ccbd251bbe82d8692b4764d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CZA167701329 — a six-check JSON result.
Serenade for Strings in E Major, Op. 22, B. 52: II. Tempo di valse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c3bd62c7b90579c35d5beb13373f27f1eca1c154e8b4f2348f49d3e2d8f546. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CZA167702329 — a six-check JSON result.
Serenade for Strings in E Major, Op. 22, B. 52: III. Scherzo. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a865a31429b61edc862eb46753da8783e623dd0331fd85d981e81c1910af78f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CZA167703329 — a six-check JSON result.
Serenade for Strings in E Major, Op. 22, B. 52: IV. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0896701f8067e352203be3fb318acd51438b225f6948d733860dbc4cb1d5d5f1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CZA167704329 — a six-check JSON result.
Serenade for Strings in E Major, Op. 22, B. 52: V. Finale. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4235b11b2fbd55832519e8a9326d2f5e01b0617b2e0d50ed8cf41874de20e66. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CZA167705329 — a six-check JSON result.
Czech Suite in D Major, Op. 39, B. 93: I. Preludium. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825df40be9e143781aff96c5329840d54f7f7f21e49d95a7613b2e5720e73c33. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA167701330 — a six-check JSON result.
Czech Suite in D Major, Op. 39, B. 93: II. Polka. Allegretto grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe69408dc210eda73366d3bfbaa399dab37cb0cb0be5af9839eb35d544b65e9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA167702330 — a six-check JSON result.
Czech Suite in D Major, Op. 39, B. 93: III. Sousedská. Allegro giusto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8048b0fd82f543c91274ff08d980939f006109c483f2dbfe33263c4346775908. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA167703330 — a six-check JSON result.
Czech Suite in D Major, Op. 39, B. 93: IV. Romanza. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6976f0de0860b227dc75c613a79754ae0078c1713022823f99a8e5f9c6e6060. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA167704330 — a six-check JSON result.
Czech Suite in D Major, Op. 39, B. 93: V. Finale. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30dbf7d80d5e30efb7e5df0c82d90f543fa2ca2d077c56ad8b8bda3e05ac0284. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA167705330 — a six-check JSON result.
Torelli, Veracini, Albinoni, Fasch: Trumpet Sonatas and Concertos
Trumpet Concerto in E-Flat Major, Hob. VIIe:1: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2e83722ae3c27882704ce5d645ffefe982e24ae6401b637ee21cbf3e1f7dce. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/CZA168801709 — a six-check JSON result.
Trumpet Concerto in E-Flat Major, Hob. VIIe:1: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be5493e7beef0ec918376a66167b96d3530fc82680a1abdc9a0cebaa7edfafa. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/CZA168802709 — a six-check JSON result.
Trumpet Concerto in E-Flat Major, Hob. VIIe:1: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77488ffc02b1a71006c9a5895594db73eed3302e6cd51ec62fe1b7715092ef71. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CZA168803709 — a six-check JSON result.
Trumpet Concerto No. 2 in D Major, MH 104: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3a9d32913b27b4b784a6503a0435f93063b8bf94dcc9fc07a3edf35d5651af. 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/CZA160301332 — a six-check JSON result.
Trumpet Concerto No. 2 in D Major, MH 104: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f534e94b38283b6e98f81561d9e588e1b691630d7e6cfae9aaa6ba42fac9b3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA160301333 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e70cacdec9b5abccd2b846b40050b9cd5e514fabed8e4b1ef38507a86aad2a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CZA160301336 — a six-check JSON result.
Trumpet Concerto in D Major: II. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0272173e94c24c03d8b3d2b74536471a103fe0140c59bc471de3b96cdb9c3d. 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/CZA160301337 — a six-check JSON result.
Trumpet Concerto No. 2 in E-Flat Major: I. Allegro ma moderatamente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e3b87657b3d47094a559e1c1487b6899bbc343eb99e85d75770825e2e1c746. 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/CZA160301341 — a six-check JSON result.
Trumpet Concerto No. 2 in E-Flat Major: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44be5ee0636c5629f583c8fd8d4330c314b408dc64062721f652e8411921736. 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/CZA160301342 — a six-check JSON result.