Phyllis Curtin (née Smith; December 3, 1921 – June 5, 2016) was an American soprano and academic teacher who had an active career in operas and concerts from the early 1950s through the 1980s. She is
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 0x178c1769ce526b8f6e8e8b5618e192d1ce0b64376a26717be4c29bd0dd0101ae. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8cba2f42-77fe-4195-8d4f-63a73d71fd1a.json and https://artists.proofprofile.net/proofs/artist/8cba2f42-77fe-4195-8d4f-63a73d71fd1a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).