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 0xf822bcab75f3e0c507973cf9755e7fde6f7a8523aa6bc7c0f3a19b1553ca3998. Chain 2 (Bitcoin): anchored in block 954004 (2026-06-16T21:01:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/31856b17-ce6e-48ec-a4a0-bd0a5042a720.json and https://artists.proofprofile.net/proofs/artist/31856b17-ce6e-48ec-a4a0-bd0a5042a720.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rachmaninoff: 10 Preludes Op. 23: No. 6, Andante
Frédéric Chopin: Etude in A-Flat Major, Op. 25, No. 1
The Eighteenth Variation from Rhapsody on a Theme of Paganini
Frederic Chopin: Ballade No. 4 in F Minor, Op. 52
Deux arabesques, L. 66: I. Andantino con moto
Frédéric Chopin: Ballade No. 1 in G Minor, Op. 23
Enrique Granados: Allegro de Concierto, Op. 46
Piano Sonata No. 23 ("Appassionata") in F Minor, Opus 57: III. Allegro Ma Non Troppo
Piano Sonata No. 23 ("Appassionata") in F Minor, Opus 57: II. Andante Con Moto
Piano Sonata No. 23 ("Appassionata") in F Minor, Op. 57: I. Allegro Assai
Rachmaninoff Prelude No. 5 in G Minor, Op. 23
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 0x0d3d5b304640e489d3f5fc1032967f48b05e1d8f74d7f62020a0625f5a6633a0. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USX9P1202312.