Ingrid Haubold (born 1943) is a German operatic soprano. After beginning her career in Munich and continuing with German companies, she moved on to major international opera houses, appearing as Isold
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 0x75d4a5437d3868d2d147bf131d7e003e17ae8a24c77a5c71c538f8f121002d0d. Chain 2 (Bitcoin): anchored in block 953621 (2026-06-14T09:42:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/20988455-e0c8-470d-900c-fffe8bbc98da.json and https://artists.proofprofile.net/proofs/artist/20988455-e0c8-470d-900c-fffe8bbc98da.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).