upright=1.35|thumb|Death of king Edmund the Martyr (right) __NOTOC__ Year 869 (DCCCLXIX) was a common year starting on Saturday of the Julian calendar. Events By place Byzantine Empire Summe
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 0xd403dc47bdf3c8584d4ab344eaa4a14df9b1a3beb6c0a5456836dc4229b880d0. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b23aec19-2ade-4cdb-b8b0-7b6e8ea28fe3.json and https://artists.proofprofile.net/proofs/artist/b23aec19-2ade-4cdb-b8b0-7b6e8ea28fe3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).