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 0x14a4cc93ac69cb680ef2dc061bfd8c2d5fdc813e005a9cdb4e5864bc185d5c30. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/224cf507-f216-4e5a-8752-bde382b2893f.json and https://artists.proofprofile.net/proofs/artist/224cf507-f216-4e5a-8752-bde382b2893f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Troisième Leçon de Ténèbres: Jerusalem, convertere
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 0x6a0e9223f341de43f310333a5442599e9ccb229e93fab3b8d3978b0351a956ea. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM11565920.
Concerto No. 1 in B-Flat Major, HWV 332: II. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a438678a84f9ea6dd6a5992135f4e1a38071ea26d0ce9ec6f29023a5b7b229. 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/FR7JM1637080.
Berg: String Quartet – Webern: Langsamer Satz – Schoenberg: String Quartet No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34952e8ab4b034fca91308350d37f4c62516fa4d98e5b46d8016c3d2a1ff6d64. 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/FR7JM1677010.
String Quartet No. 1, Sz. 40: II. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea22f28504a2c55d728883087727410b23c62d743e50e9679993594fd8d6dea. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1677020.
String Quartet No. 2, Sz. 67: II. Allegro molto capriccioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12fa1c515d92c7a4c8bbb348311594ef62f28a55ba715f91601ecfb0bf5ce1a. 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/FR7JM1677140.
String Quartet No. 1, Sz. 40: III. Allegro Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f9afca968354700b765041731b6b23a59a968608b26b3feda60c5259d169ff. 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/FR7JM1677030.
String Quartet No. 3, Sz. 85: I. Prima parte (Moderato)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa55ed0ce459a7b3be3ce7c0023a13b17be7a1c8ac50f06cfd1ce841dc80962b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1677040.
String Quartet No. 3, Sz. 85: II. Seconda Parte (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f6308ffaa9af2fe5ceb2b9a9055ad4bb744ed083f301d5b22c90eee8ca0018. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1677050.
Tchaikovsky: String Quartets No. 1 & No. 3
String Quartet No. 1 in D Major, Op. 11, TH 111: I. Moderato e semplice
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ba2ed399649625c314b12e5fe2241694d951d17a13cee4d5cdd2a78d149662. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USHM11566501.
String Quartet No. 1 in D Major, Op. 11, TH 111: II. Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc9a4de62cee40502c33ea234565ef13e24ddc7c230dc4b3f2f1013825b69c0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM11566502.
String Quartet No. 1 in D Major, Op. 11, TH 111: III. Scherzo (Allegro non tanto e con fuoco)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4bd77eb46b593c18d6824fed4e2abf273af2c7aacfaf601aa5066e260fa2697. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM11566503.
String Quartet No. 1 in D Major, Op. 11, TH 111: IV. Finale (Allegro giusto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaecde7729c884087f98c3f17160ebd71600b3088cbc01239bf6747a978d6733. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USHM11566504.
String Quartet No. 3 in E-Flat Minor, Op. 30, TH 113: I. Andante sostenuto - Allegro moderato - Andante sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6cb815a5fce3522ca1fc25cd0959997fee91c3b18693e8b3e06fa4c3408ac55. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM11566505.
String Quartet No. 3 in E-Flat Minor, Op. 30, TH 113: II. Allegretto vivo e scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76e2e0b0cfa753a8f01eb9ca8e6eadf0e30c28110e7c4a9eaed6a098b386045. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USHM11566506.
String Quartet No. 3 in E-Flat Minor, Op. 30, TH 113: III. Andante funebre e doloroso, ma con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b609e48b0e8e3e1ad3a44ea28646e3a6ff392f9081d42f267635dfab0d9531. 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/USHM11566507.
String Quartet No. 3 in E-Flat Minor, Op. 30, TH 113: IV. Finale (Allegro non troppo e risoluto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18b71fc31b15d12d277106cdfa8838c5e41c04f79c31fa301b40c4ac154224e. 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/USHM11566508.
Tippett String Quartets - Wigmore Hall Live
String Quartet No.1: II. Lento cantabile -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb5d177f29b40d29c49f0e6d0948ea1414bb5505097ef17562be2672c6801f1. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/GBNVV1500158.
String Quaret No. 2, Op. 10: III. Langsam, 'Litanei'