Otto Nossan Klemperer (; 14 May 18856 July 1973) was a German conductor and composer, originally based in Germany, and then the United States, Hungary and finally, Great Britain. He began his career a
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 0x9066591ccc529988094d7c8b11c5bf9058ab8cff67ebc3c0b8d1d44a1f46393c. 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/c3b98da2-4bd5-461b-8ae4-888a7a30ff0d.json and https://artists.proofprofile.net/proofs/artist/c3b98da2-4bd5-461b-8ae4-888a7a30ff0d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Clarinet Concerto & Piano Concerto No. 25
Mozart: Clarinet Concerto in A Major, K. 622: II. Adagio
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 0xfd65f4320e37c6cdd57ae1d8191dd2eb244df0f6c7a596e4872ccea7b459936d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBAYC9006790.
Mozart: Overtures & Eine kleine Nachtmusik (Remastered)
Mozart: Le nozze di Figaro, K. 492: Overture
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bade22de2e480ac81bf543563e89d6ce0bb0dcd6cdac1aefab1c68b30e7a89. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBAYC2203358.
Mozart: Serenade No. 13 in G Major, K. 525 "Eine kleine Nachtmusik": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1842b369982cbb7071a878c20fbbf660a8d9f93d9da4f3927bcfd75e0f8abb2. 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/GBAYC2203366.
Mozart: Don Giovanni, K. 527 (Remastered)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3a97cf2bc8b2eb8fd939e70e223c69e31be3cfdda9b9c9f3356b98df9416da. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBAYC2300865.
Mozart: Don Giovanni, K. 527, Act 1: "Notte e giorno faticar" (Leporello)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982c7cd77a35c9c95b857a9588ae08b7af5d379d4e1834a11abab382d78d885e. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/GBAYC2300866.
Mozart: Don Giovanni, K. 527, Act 1: "Non sperar, se non m’uccidi" (Donna Anna, Don Giovanni, Leporello)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c44f49d122a2edd2799fff002909738554522b155f737ed0a4910aa4028d28. 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/GBAYC2300867.
Mozart: Don Giovanni, K. 527, Act 1: "Lasciala, indegno!" (Commendatore, Don Giovanni, Leporello)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30a12cbd6e62d2962f3d4c1b4dde8deb8e17670e0095c563eab5b1f9372f4bb. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GBAYC2300868.
Mozart: Don Giovanni, K. 527, Act 1: "Fuggi, crudele, fuggi!" (Donna Anna, Don Ottavio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbcdf17b8d7e08e2a257dba9092f6aeed8b8b0c2ddb3b5b1c6e03d337dcfd54d. 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/GBAYC2300870.
Mozart: Don Giovanni, K. 527, Act 1: "Manco male è partita" (Don Giovanni, Leporello, Zerlina, Masetto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ae9d8e1e1836100ed9615a3feae1656da85ec139a73a81b9fb09e4c16c1cfd. 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/GBAYC2300876.
Mozart: Don Giovanni, K. 527, Act 1: "Ho capito, signor, sì!" (Masetto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12a1d539f9cd4b50e43639a9ebc9d4d8e54095474e5ef8424bd39a4acbe2e0c. 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/GBAYC2300877.
Mozart: Don Giovanni, K. 527, Act 1: "Alfin siam liberati" (Don Giovanni, Zerlina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc013169638e1c183747f550ebcb1787dfb5ec1ec41776cccc696635491899f90. 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/GBAYC2300878.
Mozart: Don Giovanni, K. 527, Act 1: "Là ci darem la mano" (Don Giovanni, Zerlina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b994d28222569b3237c409bfeef4df13486f0084c89a115797cee44a2277476. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBAYC2300879.
Wagner: Der fliegende Holländer, WWV 63 (Live)
Mozart: Così fan tutte, K. 588 (Remastered)
Mozart: Piano Concerto No. 25 in C Major, K. 503: I. Allegro maestoso (Cadenza by Barenboim)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea87883ee08093cfc364ee93af7e0bc37416f4816c8dd835474246d5790376a. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/GBAYC2203138.
Opera 125 (Stars of the Hungarian Opera, Vol. 1/4, 1884-2009)
Klemperer Rarities: New York, Vol. 2 (1940, 1942)
Otto Klemperer in Jerusalem Vol. 2 Mahler Symphony No. 9 (Live)
"Jupiter" - Classical Favourites by Otto Klemperer
Mendelssohn: The Hebrides, Op. 26, MWV P7 "Fingal's Cave"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9638beface9d827b67272964160cebd03269add130ee6843ef4d369099ffa16a. 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/GBAYC2202709.
Wagner: Siegfried, Act 2: Forest Murmurs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657651afe90503ac28e788acd9de7b76a593ae477e2aeeba42bb74f5074352e9. 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/GBAYC0201098.