Niklas Mattsson (born 16 March 1992) is a snowboarder from Sweden. He won a silver medal at the 2011 FIS Snowboarding World Championships in the slopestyle event. Mattsson was born in Sundsvall. Refe
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 0xd22a2b3279bb92966f99338b2080ea9c741175692947d213ab1749981756609f. Chain 2 (Bitcoin): anchored in block 954115 (2026-06-17T15:44:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7aa2697c-7370-4425-b3f4-2b69a2d759d1.json and https://artists.proofprofile.net/proofs/artist/7aa2697c-7370-4425-b3f4-2b69a2d759d1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).