Matthew Robertson (born March 9, 2001) is a Canadian professional ice hockey player who is a defenceman for the New York Rangers of the National Hockey League (NHL). He was selected by the Rangers in
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 0xef223a8e8fd6f483986ac14f357c0833034aa056fbb9f9d026b2214eb029b47b. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad61126c-3061-41bb-beb4-4b6bd75654b3.json and https://artists.proofprofile.net/proofs/artist/ad61126c-3061-41bb-beb4-4b6bd75654b3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).