thumb|A simple folded paper plane right|thumb|upright=1.3|Folding instructions for a traditional classic dart A paper plane (also known as a paper airplane or paper dart in American English, or paper
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 0xa5c137da52e8fb002a6b7d6cdd98db7d8a6ad7353792a3a087e7829361c0aece. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7b38581f-3a06-4923-9f24-66fea7984b34.json and https://artists.proofprofile.net/proofs/artist/7b38581f-3a06-4923-9f24-66fea7984b34.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).