upright=1.35|thumb|A milpa in Central America. The corn stalks have been bent and left to dry with cobs in place to indicate the planting of other crops. In agriculture, a milpa is a field for growin
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 0xde43d56c98cefb5fd522e2f6799fd850f7807a10521b5c83b900e409f10fa31b. 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/e7ad62fa-f825-4e1d-bca8-22f9133af312.json and https://artists.proofprofile.net/proofs/artist/e7ad62fa-f825-4e1d-bca8-22f9133af312.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).