Biswajit Das may refer to: Murder of Biswajit Das, a Bangladeshi tailor, in 2012 Biswajit Das (playwright) (1936–2004), Indian playwright Biswajit Das (politician) (born (1967), Indian politician
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 0xdd294b4a75e275cefdf109f88c6cbe13f611d1b5fe4d14eee0350f85bd29be23. Chain 2 (Bitcoin): anchored in block 953984 (2026-06-16T18:08:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d2ea8b4-6e06-4aed-817d-3df00cec2f4e.json and https://artists.proofprofile.net/proofs/artist/2d2ea8b4-6e06-4aed-817d-3df00cec2f4e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).