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 0xf4c4f713f576402901f53b5bddca94b291acac0d9cc861012f2fdb55b6c6c88d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/09f3cbeb-cf8a-4b6d-8058-46ea813d09a3.json and https://artists.proofprofile.net/proofs/artist/09f3cbeb-cf8a-4b6d-8058-46ea813d09a3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Trio Sonata for 2 Violins and Continuo in G Minor, HWV 393 "Dresden" No. 2: III. Largo (Arr. for Oboe, Violin, Harpsichord and Orchestra by Andreas Tarkmann)
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 0x934beeeabb07ed311242ebabc5b319c5fbc4f943e3bda497f0ce47a42097bbd5. 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/DEUM70602307.
Suite d'orchestre No. 2, Op. 47: I. Preludio. Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672bc3917f186360affc8f705f762de9c86fe1c7f3cbc61cda72e28f16fc9fc1. 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/GBJZY2055701.
Johanna d'Arc, Op. 19: I. Johannas Hirtenleben
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e8683f94ba69da1be366678d484edd77d72af712655dd3d80dbacad13c96e3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBJZY1952301.
Andrzej Panufnik: Concerto for Violin and String Orchestra: I. Rubato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010bc91c04de783efae7752167dc8f81529d98179c1adac7f1ed724e5dc070ae. 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/PLP391700054.