thumb|right|220px|Harold Bauer Harold Victor Bauer (28 April 1873 – 12 March 1951) was an English-born pianist of Jewish heritage who began his musical career as a violinist. Biography thumb|Fritz
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 0x07d1f805cd026182e246722a5e1ba2fd0c91eeb636755d7ea052ec65556cc414. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cbcb56db-02e4-4ab9-a391-d77f16ccb716.json and https://artists.proofprofile.net/proofs/artist/cbcb56db-02e4-4ab9-a391-d77f16ccb716.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
From the Depths. Beethoven, Tchaikovksy and Dvorak in Time
Jesus Bleibet Meine Freude. Bach, Brahms, Debussy & Contemporaries.
Jesus Bleibet Meine Freude, BWV 147 (Arr. Solo Piano by Bauer) - Upon Piano Roll Duo-Art 7371, Issued 1913
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 0x3b8163d3c59813428a8165a2fab651ecf67299956ade6ca3beb697463e5a79d0. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DEPI82409686.
Well-Tempered Clavier, Book I: Prelude No. 5 in D Major BWV 850 - Duo-Art 5650
Tandeln Und Scherzen. Bach, Mozart & Golden Age Piano Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf504d2604adf5ff315d95ee55f09820b369de1b38bf3aaa095ca6f57e9e70e56. 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/DEPI82437480.
Hungarian Dance No. 5, in F-Sharp Minor (Arr. Solo Piano by Bauer) - Duo-Art 5814
Home. Beethoven, Mozart and Brahms Piano Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4283db05a0439cb2d0d2877cbe3beb0ff486053a2745c1999d6a2ea7fa27ee3. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEPI82321579.
Fantasie Impromptu, Op. 66, C-Sharp Minor - Duo-Art 6058
Schmetterling. Piano Music by Chopin, Schumann and Legacy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f692202a352625e197f428e2525ab567ac49a3b7e0f31814213a74935cecf7. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEPI82307339.
String Quintet in E Major, Op. 11: No. 5, G275, Minuet in A Major (Arr. By Bauer) - Duo-Art 5889
Toccata. Piano Essentials from the Golden Age
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfc1ab3c4565a9514a7fb723a6abe7086d7796414eeb6f420f251ff9db319ac. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEPI82308741.