Pantene () is an American brand of hair care products now owned by Procter & Gamble. The product line originated in Europe in 1945 by Hoffmann-La Roche of Switzerland, which based the name on panthen
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 0x7551593a2d789052774d3b42a5e934f500bd06a5b0d8badb7b22656538f50cf1. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c9c6b026-968d-4f22-a58b-259f5504e8f6.json and https://artists.proofprofile.net/proofs/artist/c9c6b026-968d-4f22-a58b-259f5504e8f6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).