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 0xab08532a5d0f9d7179272efdb64319a1d16a53805aee8bea7cce30a4dfe781ef. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2389cdf-5915-46b9-816c-90abcad72f23.json and https://artists.proofprofile.net/proofs/artist/a2389cdf-5915-46b9-816c-90abcad72f23.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0xeb42c741201058742e3a4b9d938be92b7de7d2d7f7560b67d7082080975500d4. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR9W11118276 — a six-check JSON result.
Une soirée à l'opéra (Arr. for Clarinet Quartet)
Fantaisie sur Carmen: I. Entracte - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196c97a568b42238418b3d37b11a02d0b76be39f4b3364881d4a7959aa5baec9. 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/FR9W11421233 — a six-check JSON result.
Fantaisie sur Carmen: II. L'amour est un oiseau rebelle - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2cf7c8c920e6a6aef344a3d7a03f7dede447d8f57216acf534b98d7426953ce. 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/FR9W11421234 — a six-check JSON result.
Fantaisie sur Carmen: III. Lento - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f44443d99f8f977a6ed8b75aea96c42c98b54fa44dcf1189a78aae87d68cb54. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FR9W11421235 — a six-check JSON result.
Fantaisie sur Carmen: IV. Près des remparts de Séville - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3c2eed71fdbed28a53ea70b7fb4d5338beff366fa140e4a2018c666cb75ca4. 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/FR9W11421236 — a six-check JSON result.
Fantaisie sur Carmen: V. Les tringles des sistres tintaient - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792d13fed4138a60eee2b6ca63b17b05c534a7f27215858373ee8d4b26558a67. 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/FR9W11421237 — a six-check JSON result.
The Nutcracker, Op. 71a: I. Ouverture - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af28b9dd9f7d5562654301fe534aa703fa223e8fc6ffe7ee142e59a6fab0e84. 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/FR9W11421238 — a six-check JSON result.
The Nutcracker, Op. 71a: II. Marche - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a95c111ed3f4556518c42f30e6c8826ed186fa7756744faf9405eb888ca2ba. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FR9W11421239 — a six-check JSON result.
The Nutcracker, Op. 71a: III. Tarentelle - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3e060b4eda3643e1c25deb08161ed3969bff4fbfaea7317f4b43d6f87b12a9. 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/FR9W11421240 — a six-check JSON result.
The Nutcracker, Op. 71a: IV. Danse de la Fée-Dragée - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34af83145e952950a9fa244943247ef8e8382efc74846553b806247e2e459e40. 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/FR9W11421241 — a six-check JSON result.
The Nutcracker, Op. 71a: V. Trepak - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a2db3b808b4faabb1d50acafe4952afec7a24df485bd73217208c8231c7accf. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FR9W11421242 — a six-check JSON result.
The Nutcracker, Op. 71a: VI. Coda - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcba4b98a6b46ed5daa121132a9dd8a2538187c70ad1214804abcc488df1c25. 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/FR9W11421243 — a six-check JSON result.
Lakmé: Duo des fleurs - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccc01ae640cd5e9d91b5d3a84dde739b80a0209a4b871b857263316fd494d40. 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/FR9W11421244 — a six-check JSON result.
Il barbiere di Siviglia: I. Cavatina Conte - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d83dc58a5ab2161ea5b74c08f65de0f84180a8bf7ca675ebcfc7d08923e3af. 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/FR9W11421245 — a six-check JSON result.
Il barbiere di Siviglia: II. Canzone première partie - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b554247965a7c0675fb3b5a151f655719d19807ccd55616b948c46094455c7. 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/FR9W11421246 — a six-check JSON result.
Il barbiere di Siviglia: III. Cavatina Figaro - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ee7aaa4d219520441b469e0928e9f9b3b93407c64a1cd33c95fce50c211391. 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/FR9W11421247 — a six-check JSON result.
Il barbiere di Siviglia: IV. Cavatina Rosina - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8cef9e25a297533cacf46272df78ba84942336680149879e0ffe3176867272. 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/FR9W11421248 — a six-check JSON result.
Il barbiere di Siviglia: V. Canzone deuxième partie - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35beba2e45d1584533b87f2ccfee0c1c7b7d51e8ad6b15fcc51721925abd5a7. 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/FR9W11421249 — a six-check JSON result.
Il barbiere di Siviglia: VI. Aria Conte - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe64f1a913221976e75bfdaa52b6d1a6047dd4e4049ce10eb44373493560dce. 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/FR9W11421250 — a six-check JSON result.
Rigoletto: "Fantaisie": I. Allegro con brio - Allegro moderato - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec86f466f83883db884ead959926ce5f84efd4be3e9a8d61381201cbda23c85. 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/FR9W11421251 — a six-check JSON result.
Rigoletto: "Fantaisie": II. Andante cantabile - Adagio cavatina - Allegro vivo - Arr. for Clarinet Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b16be84e567763898d445673892b83fa74d6b08cd2eb0cf8da2096662b45fd. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/FR9W11421252 — a six-check JSON result.