Giverny () is a commune in the northern French department of Eure.Commune de Giverny (27285), INSEE The village is located on the "right bank" of the river Seine at its confluence with the river Epte.
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 0x07b71966d08ff9c78a47e355188d57b6822d58094e65f119741027504faf7e6a. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b14727f4-5c2e-4cb4-a57c-02e01707e8e6.json and https://artists.proofprofile.net/proofs/artist/b14727f4-5c2e-4cb4-a57c-02e01707e8e6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).