thumb|right|upright|Harper's Monthly, a literary and political force in the late 19th century A magazine is a periodical publication, print or digital, produced on a regular schedule, that contains an
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 0xc79237730161feec567228d61c0960123feda609e861cad74049d0a9ffeb0a12. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ecdc2e1c-9cf0-4e08-aca4-762c55de1ede.json and https://artists.proofprofile.net/proofs/artist/ecdc2e1c-9cf0-4e08-aca4-762c55de1ede.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).