Bivio (, ) is a village and former municipality in the Sursés in the district of Albula of the Swiss canton of Graubünden. On 1 January 2016 the former municipalities of Bivio, Cunter, Marmorera, Mule
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 0x0492d16a3dd7117e8b80c50d2d5c157dbc050aec46bd690492fa2d477a26ebb5. 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/b213b58a-d693-4215-8c8c-1b2529e24792.json and https://artists.proofprofile.net/proofs/artist/b213b58a-d693-4215-8c8c-1b2529e24792.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).