Drano (styled as Drāno) is an American brand of chemical drain cleaner that is manufactured by S. C. Johnson & Son. Crystal Drano According to the National Institutes of Health's Household Products
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 0x0e738647ae89a7b5784d03fb9c506b3845a88296ae0dc9627237aad3404cf461. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/666c43d2-5c34-453c-8103-6698299bde55.json and https://artists.proofprofile.net/proofs/artist/666c43d2-5c34-453c-8103-6698299bde55.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).