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 0x40aeb65b52e83459e73374f107154445446d2a0b7966e5b6141ff7ab3c460620. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2ee8d9fb-473d-402f-b45c-aaf1a534b5f5.json and https://artists.proofprofile.net/proofs/artist/2ee8d9fb-473d-402f-b45c-aaf1a534b5f5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
『スメタナ四重奏団 ライヴ・イン・ジャパン』〜ハイドン：弦楽四重奏曲《ひばり》《鳥》/ メンデルスゾーン：弦楽八重奏曲
Dvořák, Puccini & Gershwin: String Quartets
シェーンベルク：浄められた夜 / ベルク：弦楽四重奏曲 / ヴォルフ：イタリアのセレナード
Boccherini: La Musica Notturna Di Madrid, "Fandango"-Quintet & Haydn: 2 String Quartets
String Quartet No. 17 in F Major, Hob. III:17 "Serenade": I. Presto
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 0x34cb585dbfe9fcabac3581236268a92c67510dd0c4de6e04ba5f357fbd601652. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH0010900091.
String Quartet No. 17 in F Major, Hob. III:17 "Serenade": II. Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcaf3f95e17ea6491def71936d9ba4c56f24d0c778c373ecbe9dc30602f9617e. 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/CH0010900092.
String Quartet No. 17 in F Major, Hob. III:17 "Serenade": III. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38996bba4fb55067de086b573237c83233a24954bf5a68b4bcf0b15d762ff761. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CH0010900093.
String Quartet No. 17 in F Major, Hob. III:17 "Serenade": IV. Finale: Scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34594185ea89b19c76973c9989f14262aad85e7d17eaaeddabc25cc62f31e9f8. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/CH0010900094.
Quintet No. 4 in D Major for Strings and Guitar, G. 448, "Fandango": I. Pastorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42ef4ca243f91639861f070e4d95a735baf67536f4bc8478dc2910ef546fbb7. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/CH0010900086.
Quintet No. 4 in D Major for Strings and Guitar, G. 448, "Fandango": II. Allegro Maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb28e393626648a1c84ccf8044b6ebe21b6da9e688b2b6e6fc75d40afc351258. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH0010900087.
Quintet No. 4 in D Major for Strings and Guitar, G. 448, "Fandango": III. Grave Assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb235185de5900dec319066aa4c6f17f9c11d6bc31b75e7d7e151f5a85f5c5ee4. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/CH0010900088.
Quintet No. 4 in D Major for Strings and Guitar, G. 448, "Fandango": IV. Fandango
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb4aac91c8e42c54b50a09b1846cd60e324e9bfef9aa8bc2e446c30749cb259. 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/CH0010900089.
La Musica Notturna di Madrid - Foreword By The Composer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b5897469718ce645894ec2a8f903a48f0245821ccb587368ee81630cf31f39. 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/CH0010900190.
La Musica Notturna delle Strade di Madrid (From String Quintet Op. 30, No. 6 in C Major, G. 324): I. Il Tocco delle Campane & Il Tamburo del Quartier dei Soldati (Le Campane di l'Ave Maria &
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70be9b57fac49f46247c201073318caaaa20d6f4563d88b0ab0e1b341b02f286. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CH0010900080.
La Musica Notturna delle Strade di Madrid (From String Quintet Op. 30, No. 6 in C Major, G. 324): II. Minuetto dei Ciechi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e535be0d020065f689d80f71d1085d605b7b031479e9d72bad6161ab0f1635. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/CH0010900081.
La Musica Notturna delle Strade di Madrid (From String Quintet Op. 30, No. 6 in C Major, G. 324): III. Il Rosario. Largo Assai; Senza Rigor di Battuta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3b118540b6c1309a34bd3587bd4c01dd0ddb9bf297cd002fa7fa6ccc1f77c2. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CH0010900082.
La Musica Notturna delle Strade di Madrid (From String Quintet Op. 30, No. 6 in C Major, G. 324): IV. Passa Calle - Allegro Vivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab81925547132775b304eadc74372a8f6269e4b366d3a53e230264d8053ef55f. 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/CH0010900083.
La Musica Notturna delle Strade di Madrid (From String Quintet Op. 30, No. 6 in C Major, G. 324): V. Il Tamburo & La Ritirata - Maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77088a9d7f419583a802c6bf78b2762a642c01925513fb16a6028ca4ab79eb38. 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/CH0010900084.
String Quartet in G Minor, Op. 74, No. 3, Hob. III:74, "Horseman": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b251eca8b7a1ddb22d13a09bcfb191d615ff276898efe2fa1b2debfc1acafb. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CH0010900096.
String Quartet in G Minor, Op. 74, No. 3, Hob. III:74, "Horseman": II. Largo Assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861c5847835b0e9639610b81363852daff96ebcb03cfa66020db28bc1271907e. 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/CH0010900097.
String Quartet in G Minor, Op. 74, No. 3, Hob. III:74, "Horseman": III. Menuetto. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5be52a90ef9c4bf456cdd080a20701f5c2538dcf2aee630e86b44886059fa3a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CH0010900098.
String Quartet in G Minor, Op. 74, No. 3, Hob. III:74, "Horseman": IV. Finale. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf176c73e87aaa44a6f647bd9872ebe1c71953670e3113f3dae3df5ef1557504d. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH0010900099.
Robert Fuchs & Carl Maria von Weber: Clarinet Quintets
Szymanowski: String Quartets - Webern: "Langsamer Satz"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcaf3f95e17ea6491def71936d9ba4c56f24d0c778c373ecbe9dc30602f9617e. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/CH0010900092.
Piano Quintet in A Major, Op. 114, D. 667, "Die Forelle": I. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac826a92162386b010d8b056fa0504796d80e2a7b165645d5ec55c040739428. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/DEDS50913301.