Bishwadeep Chatterjee is an Indian film sound designer, sound editor and audio mixer. He won the National Film Award for Best Audiography thrice for the films Madras Cafe in 2013, Bajirao Mastani in 2
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 0x4da61d98d92c68af4438b62c5961cc79f2082a2ca65f45d77ed2dc288974977a. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/97144243-23c1-4ba4-bf3e-add52f30672b.json and https://artists.proofprofile.net/proofs/artist/97144243-23c1-4ba4-bf3e-add52f30672b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).