thumb|In 1995, FDA's assertion of authority to regulate tobacco drew heavy opposition from the tobacco industry, which erupted into lawsuits and slogans urging "Keep FDA Off the Farm." thumb|An old In
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 0x251b999ac6a5f4818c925b8853dbd6c4057e6de4dfe2f5a908db18c6febcd544. Chain 2 (Bitcoin): anchored in block 953871 (2026-06-16T01:46:03Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/076b3438-c2ad-426b-a325-0e8e4759c4a3.json and https://artists.proofprofile.net/proofs/artist/076b3438-c2ad-426b-a325-0e8e4759c4a3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).