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 0xd64e5afe9dd87f192c8649496fcbf035ac4ca929d2781593d74cffab7480704b. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e29f9136-cab3-4482-8d7f-571aa31f55d8.json and https://artists.proofprofile.net/proofs/artist/e29f9136-cab3-4482-8d7f-571aa31f55d8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
C. P. E. Bach: Sonatas with Varied Reprises, Wq. 50
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 0x52a16d0ad14a311d40df35f17388c72d9f486f507d4287bef809d5024d9a519b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM7282416459.
Sonata in G Major, Wq. 50/2: I. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6842c364da55c04f7c318608f4dcd3893aa70f2c5c5d6b05605a780ba4afa380. 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/QM7282416461.
Sonata in G Major, Wq. 50/2: II. Poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766dfe613f01d48f0feba38505b14a1c6f081bd2a08aa881e2b660d1efc66c68. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM7282416462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd886de3439d4b0e41ba044a97155d1b97f4579ccf29998062327da990fd66afc. 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/QM7282416465.
Sonata in F Major, Wq 50/1: I. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6b66681c0c17c7f0b8606efb1cdf0c2e7c960d1a2fbfe402a7028d1153d94d. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM7282416458.
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
Sonata in F Major, Wq. 50/1: III. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6400c52adbca5f12cc5ac2a2e6361dd0b5cadb0361bc421a5a7c43d50bff4006. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QM7282416460.
Inside the Hearing Machine - Beethoven on His Broadwood
Haydn: Keyboard Sonatas Nos. 54-62 / Un Piccolo Divertimento
The Virtual Haydn: Complete Works for Solo Keyboard
Mendelssohn & Zelter: Des Mädchens Klage
Mozart: Selected Piano Works (VRT Muziek Edition)
Sonata in A Minor, Wq. 50/3: III. Allegro moderato ma innocentemente
Beethoven: Intégrale des sonates pour piano sur instruments d'époque: Volume I
Beethoven: Intégrale des sonates pour piano sur instruments d'époque: Volume II
The Romantics, Vol. 12: Des Mädchens Klage