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 0xb3ac96c7ea6b6d2e8f4c386707be5a87a938e07725d52c260df3348bc5dccb1a. Chain 2 (Bitcoin): anchored in block 954115 (2026-06-17T15:44:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79a317aa-3b23-42a2-9e89-e36687eb9147.json and https://artists.proofprofile.net/proofs/artist/79a317aa-3b23-42a2-9e89-e36687eb9147.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
4 Preludes, Op. 17: No. 2, Con molto sentimento
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 0xa600a5ca5cd9d737ce0636e8b4aadec40f144a817cf790b64af18adb46091fae. 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/DEAD62305205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38df8930f77d836b5b1764d8ba80ff2fe2242c3768dcac315649b1e238399593. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/DEAD62305222.
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
Chopin: Ballades Nos 2 & 4, Scherzo No. 4, Mazurkas & Waltzes
Catoire: String Quartet, Op. 23 & Piano Quintet, Op. 28
Clara Wieck, Brahms, Liszt, Schumann & Godowsky: Fantasiebilder aus Wien (Piano Works)
Dvořák: Legends & From the Bohemian Forest (Versions for Piano Four-Hands)
Johannes Brahms: Sonate für Klarinette und Klavier, Op. 120 - Fantasien für Klavier solo, Op. 116
Shostakovich: Prelude B Minor Op. 87 No. 6
3 Romances, Op. 21: I. Andante in A Minor
From the Bohemian Forest, Op. 68, B. 133: V. Silent Woods (Lento e molto cantabile)