The Vilan is a mountain in the Rätikon range of the Alps, located north of Malans in the Swiss canton of Grisons (), on the border between the Landquart and Prättigau/Davos districts. It lies south of
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 0x3c144adde86a68b5d4ecb8edfe9d1d45e064f71edc856855053f8936d9bfb1ad. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cdda002f-2760-4837-9ae5-b95b0f5ed315.json and https://artists.proofprofile.net/proofs/artist/cdda002f-2760-4837-9ae5-b95b0f5ed315.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).