The Tribune or Tribune is the name of various newspapers: United States Daily California Oakland Tribune The Tribune (San Luis Obispo) The San Diego Union-Tribune San Gabriel Valley Tribune Indiana
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 0x84a2bfd98dd65c5e71ec89cb0b8164c867e8e3a3225b093a03cfac65542d2da5. Chain 2 (Bitcoin): anchored in block 954031 (2026-06-17T01:43:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b22b0e8-0a2e-4f57-8cd1-f1a2270236de.json and https://artists.proofprofile.net/proofs/artist/3b22b0e8-0a2e-4f57-8cd1-f1a2270236de.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.