The Silenced () is a 2015 South Korean mystery-thriller film written and directed by Lee Hae-young, starring Park Bo-young, Uhm Ji-won and Park So-dam. Plot Set in Keijō (Seoul) in 1938 during the Ja
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 0x4008b2c3398b09fa536365c8f7cb172a3d441969e251b68f6460e7cb08e1fb3a. 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/87fc65e0-e821-4018-8ed2-d17919795dd1.json and https://artists.proofprofile.net/proofs/artist/87fc65e0-e821-4018-8ed2-d17919795dd1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).