The Saône ( , ; ; ) is a river in eastern France (modern region of Bourgogne-Franche-Comté). It is a right tributary of the Rhône, rising at Vioménil in the Vosges department and joining the Rhône in
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 0xf227588415da693d4be56f883adab58070b32cbd32b182274605a8c632b0f19c. 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/8ae71d99-3079-4fd4-b866-92e4e21830a0.json and https://artists.proofprofile.net/proofs/artist/8ae71d99-3079-4fd4-b866-92e4e21830a0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).