Margaret Harshaw (May 12, 1909 – November 7, 1997) was an American opera singer and voice teacher who sang for 22 consecutive seasons at the Metropolitan Opera from November 1942 to March 1964. She be
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 0x6ba377cd4620847fe982d030c085c28bc8ad82e59fc750944c161197c15f7554. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/75c33fa3-54b3-48d7-a491-330e6504a90d.json and https://artists.proofprofile.net/proofs/artist/75c33fa3-54b3-48d7-a491-330e6504a90d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Wagner: Götterdämmerung (Live Recordings 1957)
Lebendige Vergangenheit - Richard Tucker Vol.III
Der Ring des Nibelungen - Metropolitan Opera 1951 Fritz Stiedry
Lauritz Melchior, The King Size Hero, Vol. 3 (Recordings 1920-1947)
Mascagni: Cavalleria rusticana (Mono Version)
Mascagni: Cavalleria Rusticana & Leoncavallo: Pagliacci (Remastered)
Mozart: Don Giovanni, K. 527 (Recorded 1954)
Verdi: Il trovatore (Recorded 1947) [Live]
Verdi: Un ballo in maschera (Live Recording 1947)
DIe Walküre Act 3 complete and Orchestral Ring excerpts conducted by Artur Rodzinsky
Pierre Monteux with the Boston Symphony Orchestra (1958, 1959)
Georg Solti: Don Giovanni, Glyndebourne, 1954
Verdi: Il trovatore (Metropolitan Opera Broadcast)