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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289eb676c6d2a935f95742778f3a4e1b4ca3bb7d301c7462360210dbb7dcdd8b. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e1459bc2-436a-47f1-ab90-8bd834950d8d.json and https://artists.proofprofile.net/proofs/artist/e1459bc2-436a-47f1-ab90-8bd834950d8d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schubert: Quartet in D Minor "Death and the Maiden"; Mendelssohn: Quartet in F Minor, Op. 80
Beethoven: Complete String Quartets - Colorado Quartet (MC Classical Library)
Piano Quintet in A Major, D. 667, "The Trout": IV. Andante (Excerpt)
Classical Music for Learning: Great Masterpieces to Improve Studying and Mental Focus
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x003685473953093aea650dd36b72e56cfb882384c3cb76d1385d5eee418aa8bc. 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/US5541301593.
Piano Quintet in A Major, D. 667 - "The Trout": IV. Andante (Excerpt)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130889c4ed9e2cb13b287047d0b5e3e861b48ed7463cf17e20a0e3daec0cff31. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US5541202629.