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 0xb5f2a1221a4ab71d0da1ba32e0d1893543f26f09ca710aacfb06b28797e5ade6. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/831339f7-b8c3-4e7b-bbd4-7cd22b6385a6.json and https://artists.proofprofile.net/proofs/artist/831339f7-b8c3-4e7b-bbd4-7cd22b6385a6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Violin Sonatas KV. 301, KV. 303, KV. 305, KV. 454
Sonata for Violin and Piano in B Minor: 2. Andante espressivo
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 0xdc6c0bcf719509ec2a2c64e64b678789bff8cea852466a118bef17a7815dc024. 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/ITUM71800820.
Beethoven: Violin Sonatas Nos. 1, 2, 5 "Spring" And 8
Beethoven: Violin Sonatas Op. 12, Op. 23, Op. 47
Mozart: Sonata, Op. 1 No. 5, KV. 305: I. Allegro di molto
Mozart: Sonata, Op. 7 No. 3, KV. 454: III. Allegretto
'Figaro', Fantasia for Violin and Piano From 'Il Barbiere di Siviglia'
Nicola Campogrande: Danze della signorina Olivia
Grandes Clásicos De Violín - La Mejor Música Clásica
Busoni: Violin Sonatas Nos. 1 & 2 & 4 Bagatelles
Busoni: 4 Bagatelles, Op. 28: III. Wiener Tanzweise
Busoni: Violin Sonata No.2 in E Minor, Op. 36a: II. Presto