Rajnandini () is a Bengali romantic drama film directed by Sukhen Das. This film was released in 1980 under the banner of S.D Films. Cast Uttam Kumar Bikash Roy Subhendu Chatterjee Sabitri Chatte
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 0x03beb67ff2ec7e4b8340d0856d0a0fa896cf81949c1bfdb3a0b4c98e788a16c0. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3efd1c0-5acd-4c10-a2a3-957a0d8958df.json and https://artists.proofprofile.net/proofs/artist/d3efd1c0-5acd-4c10-a2a3-957a0d8958df.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).