Ursula Boese (27 July 1928 – 25 October 2016) was a German operatic contralto. A member of the Hamburg State Opera from 1960 to 1993, she pursued an international career. She appeared as Stravinsky's
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 0xa0a1017941d38e20a05307174d8d0190f2372078ba3744a74c15f831c507c1a4. Chain 2 (Bitcoin): anchored in block 953928 (2026-06-16T10:21:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e7af72f-47af-486d-a24e-fb565f85da6a.json and https://artists.proofprofile.net/proofs/artist/1e7af72f-47af-486d-a24e-fb565f85da6a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Wagner: Die Walküre, WWV 86B (Live Recordings 1958)
Kienzl: Der Evangelimann, Op.45 (Highlights)
Lulu, Act III (Compl. Cerha): Meine Herrn und Damen! – Der Staatsanwalt bezahlt demjenigen
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31559e4da276c69c4ef766ff67f0a686c7834559fa2fdfb95b2095c0f2d6adb. 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/DEF057930924.