thumb|Emanuel List by Nicola Perscheid thumb|Grave of Emanuel List and his wife Johanna in the Jewish section of the Zentralfriedhof in Vienna Emanuel List (March 22, 1888, in Vienna – June 21, 1967,
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 0xb34afae6f9b65ec8c947e7afd0df0a10abd9e3e0d0e3368380ad611031b5534d. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9ef3066c-6e29-4989-bf0a-e00681204280.json and https://artists.proofprofile.net/proofs/artist/9ef3066c-6e29-4989-bf0a-e00681204280.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Wagner: Premier acte de La Walkyrie (Mono Version)
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 0x07f34f612f87573281d50593e1fd792787438654d2bba802121898ac489452d2. 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/USB8U1519048.
Don Giovanni, K. 527: Act I Scene 1: Notte e giorno faticar (Leporello, Donna Anna, Don Giovanni, Il Commendatore)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57172a463ec05abc8c63b94f581fc77b2dc170c14fad636aebeddbc56fe2fbee. 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/USB8U1519049.
Parsifal Lauritz Melchior's only surving recording live
Strauss, R.: Rosenkavalier (Der) (Lehmann / Stevens) (1939)
Von der Königlichen Hofoper zur Staatsoper Unter den Linden
Mozart: Don Giovanni, K. 527 (Recorded 1954)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b0f927dfe0a974c789138a3cf3e34a73949cdb368e83dbbc6f9a5064f3d464. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/ATP130194514.
Bruno Walter The Early Recordings: Mozart, Schubert, Haydn, Beethoven, Wagner, Mahker
Richard Strauss: Der Rosenkavalier, Op. 59, TrV 227 (Live Recordings 1946)
Lebendige Vergangenheit - Rudolf Laubenthal
Orchester Des Deutschen Opernhauses Berlin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a70fb7b0ae9c41323eb7e75f49877999169fc491b1c80edcf2c83273643a92. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ATP130460611.
Wagner, R.: Walkure (Die), Acts I and Ii (Ring Cycle 2) (Bruno Walter) (1938)
Mozart: Die Zauberflöte (Grand Théâtre de Genève, 25 septembre 1949)
Die Meistersinger von Nurnberg (1919-1930)