Martha Lipton (April 6, 1913 – November 28, 2006) was an American operatic mezzo-soprano and music educator who is best known for her career performing at the Metropolitan Opera ("The Met") from 1944
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 0xd800eb07760bd37830593b16cb93d8c4f4bedf25228bb93d9798816f400c3304. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/efee9d21-1634-42f0-847a-bf61ab322a75.json and https://artists.proofprofile.net/proofs/artist/efee9d21-1634-42f0-847a-bf61ab322a75.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mussorgsky: Boris Godunov (Sung in English) [Live Recording 1956]