Helin is a lake which lies in Vang Municipality in Innlandet county, Norway. The southeastern shore of the lake forms the municipal border with neighboring Vestre Slidre Municipality. The lake is regu
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 0x994a53c79cab765dcc85c1f43f6a5cb501f039867024d31d611a99606d5590d6. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/71af6a87-8df1-4898-a120-d296e77832a5.json and https://artists.proofprofile.net/proofs/artist/71af6a87-8df1-4898-a120-d296e77832a5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).