thumb|upright=1.35|Durian fruit cut open to show the edible flesh The durian () is the edible fruit of several tree species belonging to the genus Durio. There are 30 recognised species, at least nin
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 0x7aba441152f37d877ff6d88ad69cc23743831afa9d1e1a12dea277f30ce9078d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05239e58-51b9-45b0-8284-163cdc4dd934.json and https://artists.proofprofile.net/proofs/artist/05239e58-51b9-45b0-8284-163cdc4dd934.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).