Heineken Lager Beer (), or simply Heineken (), is a Dutch pale lager beer with 5% alcohol by volume, produced by the Dutch brewing company Heineken N.V. It is typically sold in a green bottle with a r
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 0x5e7432127f6675d1e8c830e4d90e551a3954b4fd72cebc8969ca1518de9be91d. Chain 2 (Bitcoin): anchored in block 953857 (2026-06-15T23:34:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02945d8b-95f6-4401-a1a2-c506df779a8b.json and https://artists.proofprofile.net/proofs/artist/02945d8b-95f6-4401-a1a2-c506df779a8b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.