Ulf Andersson (born 27 June 1951) is a leading Swedish chess player. FIDE awarded him the International Master title in 1970 and the Grandmaster title in 1972. Chess career At his peak, Andersson rea
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 0x245d9f64424ef06c2aa930167870bc51a22de661559c1185027c69300428e507. Chain 2 (Bitcoin): anchored in block 954588 (2026-06-20T19:15:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b8c0f84c-2147-46c7-9b50-ff9ab9a4a76c.json and https://artists.proofprofile.net/proofs/artist/b8c0f84c-2147-46c7-9b50-ff9ab9a4a76c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).