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 0x30cd30f1f997b811bc50e335abeefb45f69ac8e31013e9e1a081272f39811797. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bee7f1ad-9a00-4caf-bc93-50a9e683f230.json and https://artists.proofprofile.net/proofs/artist/bee7f1ad-9a00-4caf-bc93-50a9e683f230.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Tchaikovsky: String Quartet No.1; Borodin: String Quartet No.2; Shostakovich: String Quartet No.8
Janacek: String Quartets; Suk: String Quartet No. 1
Elgar: String Quartet in E Minor - Walton: String Quartet in A Minor
Tchaikovsky: String Quartet No.1 / Borodin: String Quartet No.2 / Shostakovich: String Quartet No.8
Tchaikovsky: String Quartet No. 1 – Borodin: String Quartet No. 2 – Shostakovich: String Quartet No. 8
String Quartet No. 2 in D Major: III. Notturno. Andante
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 0xc8ce744a0cdf200922f8c18c08142b07dccc1c595330399b4e4a3e5b864c69f6. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/GBF076110523.
String Quartet No. 8 In C Minor, Op. 110: IV. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c76397df98755f190d15a84d3901d5ca0f7b64bbbd292bcde506f19637c9af. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/GBF076110534.
Prokofiev: Piano Concertos Nos. 1-5; Classical Symphony; Autumnal; Overture on Hebrew Themes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47b9d065070dbf81fa37a9636a9b12418ec15d2e5bb33f7b465a301349314b9. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBF077411970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9464cf6b177c7cb478c6f7059272d871d72f030b4118be786ea4ad77e3dce8fb. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR8Z02000120.