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 0x94ac4f7875c9c3148ec44a53774ef549185a5128b9e55c5b0861a61aa175e3ee. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc254cc1-4e8b-47f7-81af-cd571193264b.json and https://artists.proofprofile.net/proofs/artist/dc254cc1-4e8b-47f7-81af-cd571193264b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schubert: Piano Trios In E Flat Major, D. 929 And D. 897
Piano Trio No. 2 In E Flat Major, Op. 100, D. 929: I. Allegro
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 0xb94f8a1c0cdb9d296a5b4f6a814ff86bd692d430f42a37d4e457d308375062d9. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:05:45Z), 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/HKI199301801.
Piano Trio No. 2 In E Flat Major, Op. 100, D. 929: III. Scherzando - Allegro Moderato - Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472e9c0fcb9d879926e54d1f919cb3ab4b54ced623d85c70e3f3e473be7ca108. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:44:17Z), 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/HKI199301803.
Piano Trio In E Flat Major, Op. 148, D. 897, "Notturno": Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a0e4156dd73d7bb0effe546f7c3c8ccc02c073ebfc6f64f32c966ca45dfd09. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/HKI199301805.
Schubert: Piano Trios In B Flat Major, D. 898 And D. 28
Lalo, Debussy & Rachmaninoff: Piano Trios