TiTi () is a 2020 Iranian drama film directed by Ida Panahandeh and written by Panahandeh and Arsalan Amiri. The film screened for the first time at the 33rd Tokyo International Film Festival. In 2021
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 0xd52689c399dc0ffd1d7818fe0f6a74c221fd39966471dbd18da06ec0ecbacd2a. Chain 2 (Bitcoin): anchored in block 953864 (2026-06-16T00:30:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/048b41a7-c8a5-4d8a-865d-d5508289d31d.json and https://artists.proofprofile.net/proofs/artist/048b41a7-c8a5-4d8a-865d-d5508289d31d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).