thumb|Caterina Mancini,1951 Caterina Mancini (10 November 1924 – 21 January 2011) was an Italian dramatic coloratura soprano, primarily active in Italy in the 1950s. Mancini was born at Genzano di R
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 0xd3e402b41ca12f14aae288219a96d9a393c412dbd93ced646cd2b4daabfc11ca. 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/84dc370b-13e5-4ae8-badd-fc771b4950df.json and https://artists.proofprofile.net/proofs/artist/84dc370b-13e5-4ae8-badd-fc771b4950df.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).