Hildegarde Loretta Sell, known as Hildegarde (February 1, 1906 – July 29, 2005) was an American cabaret entertainer, singer and piano player. At the peak of her career, Hildegarde was popular for her
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 0x9f90afd68f1261f7172ea19924fc61da289feaebcb297adb83cc16389738d416. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2122b2e7-066c-4d0c-9a07-2be02837d546.json and https://artists.proofprofile.net/proofs/artist/2122b2e7-066c-4d0c-9a07-2be02837d546.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hildegarde Sings "The Incomparable Hildegarde"
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 0x4ad555aa893391b7396668809b6a7ca0d5028df3b5d480d5d44956e89d824856. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QM6XS1600236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577129010fdd7cf97a74b303938feceb9ff4048e1a3e80c94b7e2bec48e1c514. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM6XS1600260.
New Songs by the Incomparable Hildegarde
Let's Face It (From the Musical ''Let's Face It'')
Lady in the Dark (From the Musical ''Lady in the Dark'')