Pratima Bandopadhyay (; 21 December 1934 – 29 July 2004; born as Pratima Chatterjee aka Pratima Chattopadhyay) was a Bengali playback singer from Kolkata, who sang numerous songs in popular Bengali la
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 0xee689da6fa44e1dedc216598370dbc061d1cff2b53041808c9ad2f444c4c5860. 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/92907c3b-7a00-431d-8bc9-723e8db0190d.json and https://artists.proofprofile.net/proofs/artist/92907c3b-7a00-431d-8bc9-723e8db0190d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).