upright=1.35|thumb|Emperor Nikephoros II (c. 912–969) Year 963 (CMLXIII) was a common year starting on Thursday of the Julian calendar. Events By place Byzantine Empire March 15 – Emperor Rom
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 0x828c8230730744f4d94d5e1fc384845b9a65b3241457790ae2a75cd4062bde4f. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ea4d5100-db1c-4825-b59a-3f9133538a5d.json and https://artists.proofprofile.net/proofs/artist/ea4d5100-db1c-4825-b59a-3f9133538a5d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).