Rufskin is an American men's athletic, underwear, swimwear, sportswear and denim manufacturer headquartered in San Diego, California. Founded in 2002, the company is owned and operated by designer Hub
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 0xd22b486d3a0702eead26f3861fa00f9bac898f4f5021c401f6587a9211b621bc. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/773e91f4-fb1d-49ac-ada0-8669da83ff0a.json and https://artists.proofprofile.net/proofs/artist/773e91f4-fb1d-49ac-ada0-8669da83ff0a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).