right|thumb|125px|Block-printed velveteen fabric designed by William Morris Velveteen (or velveret) is a type of woven fabric with a dense, even, short pile. It has less sheen than velvet because the
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 0x676a5b5ff65ff6e9b6eeca4767c5e13f3769613a9a6d8234887050251078cbf1. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35f370ff-81c2-41a1-afa3-fcb51fadcee7.json and https://artists.proofprofile.net/proofs/artist/35f370ff-81c2-41a1-afa3-fcb51fadcee7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).