Francesco Petrini (1744–1819) was a harpist and composer. Petrini, whose father was harpist of the chapel royal in Berlin, became famous in Paris for his compositions Variations and Concerto for Harp
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 0xc594ccf7b520eab89f26084a339106bbd176ef2529213711bd6bcb3c12c763eb. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb643bc8-1918-49ac-a7e8-d9ba20a42e52.json and https://artists.proofprofile.net/proofs/artist/fb643bc8-1918-49ac-a7e8-d9ba20a42e52.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).