thumb|upright|German chamomile, Matricaria chamomilla thumb|upright|Roman chamomile, Chamaemelum nobile Chamomile (American English) or camomile (British English; see spelling differences) ( or ) is
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 0xd899f71092dbde22806d3352a57858c75a1fbebd11cbdec63010815ccf330afe. Chain 2 (Bitcoin): anchored in block 953996 (2026-06-16T20:04:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2fb40e76-16ed-43dc-af88-80a5665e889a.json and https://artists.proofprofile.net/proofs/artist/2fb40e76-16ed-43dc-af88-80a5665e889a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).