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 0xe54193126b70825782c419a9889f4ab7334fe3fdb547cd1b5fffd39f7b241cf0. 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/b198e869-b7b9-4e62-8560-cd1d465e6f95.json and https://artists.proofprofile.net/proofs/artist/b198e869-b7b9-4e62-8560-cd1d465e6f95.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x210eadd0da44e0aae3ee790b6875dae3834fb2718c142421f7daaca212075d8a. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/DEA370602148.
Schubert: Sonaten, Op. 143 und Op. posth.
Prokofiev: Sonate No. 7, Op. 83 - Romeo und Julia, Op. 75
Chopin: Polonaise-Fantaisie, Sonate in B Minor, Nocturnes, Mazurkas
Beethoven: Mondscheinsonate, Appassionata, Pathetique
Beethoven: Sonate in A-Flat Major, Op. 26 - Schubert: Sonate in B Major, D. 960
Schumann: Humoreske, Op. 20 - Brahms: Sonate No. 3 in F Minor
Chopin: Vier Balladen - Wagner, Liszt: Isoldes Liebestod