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 0x40aeb65b52e83459e73374f107154445446d2a0b7966e5b6141ff7ab3c460620. Chain 2 (Bitcoin): anchored in block 953627 (2026-06-14T11:43:04Z). 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": II. Andante cantabile
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 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": IV. Finale: Scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34594185ea89b19c76973c9989f14262aad85e7d17eaaeddabc25cc62f31e9f8. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/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 957065 (2026-07-07T16:43:21Z), 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 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/CH0010900087.
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 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/CH0010900190.
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 957075 (2026-07-07T18:50:38Z), 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 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": II. Largo Assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861c5847835b0e9639610b81363852daff96ebcb03cfa66020db28bc1271907e. 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/CH0010900097.
Szymanowski: String Quartets - Webern: "Langsamer Satz"
Robert Fuchs & Carl Maria von Weber: Clarinet Quintets
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcaf3f95e17ea6491def71936d9ba4c56f24d0c778c373ecbe9dc30602f9617e. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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.