Franca is a municipality in the state of São Paulo, Brazil. The city is located in the northeastern portion of the state, 401 km (249 mi) from the state capital São Paulo, and 676 km (420 mi) from Bra
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 0xeddb2e2b5a052e3559237049465fb4ac17b50e355259bf5c2947cd8b88958f08. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d378634b-52e2-4b6d-a0a9-f78ff8868a1f.json and https://artists.proofprofile.net/proofs/artist/d378634b-52e2-4b6d-a0a9-f78ff8868a1f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).