thumb|right|Minttu peppermint liqueur. thumb|right|Minttu Black Mint salmiakki liqueur. Minttu (Finnish for "mint") is a Finnish brand of peppermint-flavoured liqueur produced by Hartwall. A character
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 0xc676e0c9a37355fbdade11640935a7eea3e6f798bb8efa84ea1904eefd3c3ecb. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f496d00-49cd-47d3-b5a6-66f66d150bc2.json and https://artists.proofprofile.net/proofs/artist/8f496d00-49cd-47d3-b5a6-66f66d150bc2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).