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 0xaab2b98ccc3f650cab10803a3eaa98f898ed6d5ec0ce74a01a7adfbe9793bfc8. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4eb04c3-afc4-4b3d-8977-e51a32e67b46.json and https://artists.proofprofile.net/proofs/artist/d4eb04c3-afc4-4b3d-8977-e51a32e67b46.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
14 Songs, Op. 34: No. 14. Vocalise (arr. M. Press)
Violin Recital: Koljonen, Elissa Lee - Chopin, F. / Elgar, E. / Rachmaninov, S. / Kreisler, F. / Liszt, F. (Heartbreak - Romantic Encores for Violin)
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 0x407e0979a17c3677623cf4c796139ddd2dd9d05f47aa6f19a46f0a6a7bc42d3f. 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/USB8U1032098.
6 Morceaux, Op. 51: No. 6. Valse sentimentale (arr. M. Press)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2749e218b245a90a1c190f667a4f2b8661ed5bd5634126caa553845e2a125445. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:57:26Z), 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/USB8U1032104.
Rachmaninov / Arr. Press & Gingold for Violin and Piano: 14 Romances, Op. 34: No. 14, Vocalise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0837c7fdac9d7ece69cab0fab6c2af2e99211a3fa8df0a818b9643887a24458. 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/GBAYC7200193.