Kaptaan () is a 2016 India Punjabi action/courtroom drama film directed by Mandeep Kumar and starring Gippy Grewal, Monica Gill, and Karishma Kotak. The release date of the film was 20 May 2016. Cast
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 0x538496c521c5bf82dee531fa121fa5c69b91bf44958f361926b800cb1040e235. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c13b30fc-ac4e-4574-bd9e-fc919e8af872.json and https://artists.proofprofile.net/proofs/artist/c13b30fc-ac4e-4574-bd9e-fc919e8af872.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).