The Blanda () is a river in Iceland which flows northwards from the northwest side of the Hofsjökull glacier into Húnaflói bay at Blönduós. The Blanda is one of the longest rivers in the country, with
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 0x8aa582a715caff07206a253e88b00a42c5076b86a4d91d834a45635b83a86be5. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/12824dd8-a478-4448-b64c-5ab5a6dd4703.json and https://artists.proofprofile.net/proofs/artist/12824dd8-a478-4448-b64c-5ab5a6dd4703.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).