thumb|250px|Ground cracks at an east–west segment of Kamoamoa after its 2011 fissure eruption. The geologist is about tall. A fissure is a long, narrow crack opening along the surface of Earth. The
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 0x98ae8cd2d266eee2f7f80502169f4f3d6cfc1af4605914e6cfd0b1f283bdc6a6. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e75878d5-44fd-45d2-952e-e1692055f215.json and https://artists.proofprofile.net/proofs/artist/e75878d5-44fd-45d2-952e-e1692055f215.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).