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 0x8675391edd9021779eed808fbfbd3b3d0b227b62621a3f3120411c4f89143460. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b9662b62-5d70-4d52-9c1f-44b4ea2c06eb.json and https://artists.proofprofile.net/proofs/artist/b9662b62-5d70-4d52-9c1f-44b4ea2c06eb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Sinfonia Concertante for Violin, Viola and Orchestra in E-Flat Major, K. 364 (Digitally Remastered)
Silvestrov, Pärt, Ustvolskaya: Misterioso
Post Scriptum - Sonata For Violin And Piano: 2. Andantino
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 0x285a97589f4227fe8ccbd01977ef6fb68591c9be27ebf21b00d0a85667e0d808. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEB330595902.
Spiegel im Spiegel - For Clarinet And Piano: 1. Spiegel im Spiegel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52978374e118a2ed965742d23321c6c53337641002251e752343a2ec08a808c4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEB330595905.
Kikta: Sonata for Violin and Harp - Saint-Saëns: Fantasie, Op. 124 - Rossini: Andante and Variations on "Di tanti palpiti" - Rajna: Suite for Violin and Harp
Glazunov: Piano Concerto No. 1, Concerto ballata in C Major - Arensky: Violin Concerto in A Minor