upright=1.35|thumb|Muhammad (veiled face) advancing on Mecca Year 630 (DCXXX) was a common year starting on Monday of the Julian calendar. The denomination 630 for this year has been used since the ea
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 0x3628e94a7d44e05117382648366c4f28e4ea02a4b6e2423ac2bf7e55df5ab5af. Chain 2 (Bitcoin): anchored in block 953867 (2026-06-16T01:09:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/04c89840-6171-41a4-9cc4-e73ce0d32da0.json and https://artists.proofprofile.net/proofs/artist/04c89840-6171-41a4-9cc4-e73ce0d32da0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).