226x226px|thumb|A single-breasted, reefer-style, navy blue blazer, dressed with brass buttons thumb|right|250px|A patch logo blazer from historic Ivy style retailer J. Press A blazer is a distinct t
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0980a30a6479a25343c906cd1fd164b82b70d2f35b0ac9200f96c4b2571c606f. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f5ffe55b-3d8a-4273-97dd-b4e1fa1b104c.json and https://artists.proofprofile.net/proofs/artist/f5ffe55b-3d8a-4273-97dd-b4e1fa1b104c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).