thumb|upright|A classic wine bottle thumb|upright|Composite body, painted, and glazed bottle. Dated 16th century Iran. A bottle is a narrow-necked container made of an impermeable material (such as g
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b929b2487aa7d26275c921553c13b6a49992a72c3e6870f2ef807cd050e058. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4b71c2ae-5f3a-4c96-a1e1-36871f3cd6f7.json and https://artists.proofprofile.net/proofs/artist/4b71c2ae-5f3a-4c96-a1e1-36871f3cd6f7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).