thumb|upright=1.2|Denim fabric dyed with indigo thumb|right|upright=1.2|Denim fabric dyed with indigo and black dyes and made into a shirt Denim is a sturdy cotton warp-faced textile in which the wef
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 0xda74eac98f134706c5c65c80551be90eb23193688fbad04cc8946d44e110ba1e. 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/58a61cbe-9898-4b7a-b105-38be1e24e199.json and https://artists.proofprofile.net/proofs/artist/58a61cbe-9898-4b7a-b105-38be1e24e199.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).