thumb|Iron ore (banded iron formation) thumb|Manganese ore – psilomelane (size: 6.7 × 5.8 × 5.1 cm) thumb|Lead ore – galena and anglesite (size: 4.8 × 4.0 × 3.0 cm) Ore is natural rock or sediment th
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 0xcbd543c5d4ae105bbcd52f2d579ca8a89bb09dfc6c46a75edd86ba9f6c765317. Chain 2 (Bitcoin): anchored in block 954593 (2026-06-20T19:46:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be573cfc-0ee9-4f8b-8c00-c53a9e59e4c6.json and https://artists.proofprofile.net/proofs/artist/be573cfc-0ee9-4f8b-8c00-c53a9e59e4c6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).