Motreb (, meaning The Singer) is a 2019 Iranian comedy film directed, written, and produced by Mostafa Kiaie and starring Parviz Parastui, Elnaz Shakerdoost, Mehran Ahmadi, Ayşegül Coşkun, and Mohsen
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 0x423c1c3b6cb62328f2d1caa17aeb52686aff7e0ee4f7993d963502cd36b4fbf8. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/047272ac-4670-4476-9859-29829ad5a2df.json and https://artists.proofprofile.net/proofs/artist/047272ac-4670-4476-9859-29829ad5a2df.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).