Cristina Barbieri (born 12 June 1963), best known as Diana Est, is an Italian singer who retired in the mid-1980s. Life and career Born in Milan, Barbieri started her career as the vocalist in a ne
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172bf284829d8df624b99222759235ec143eb20d8514773e4a48475f732b3c95. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da9bb5bd-1778-4031-bb37-3a7360830a2d.json and https://artists.proofprofile.net/proofs/artist/da9bb5bd-1778-4031-bb37-3a7360830a2d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.