Ramkanai Das (; 1935 – 5 September 2014) was a Bangladeshi folk and classical musician. He was awarded Ekushey Padak by the government of Bangladesh in 2014. Early life Das was born in Sullah Upazila
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2d39bfc55973e6d32ac2eb80fe7ec7e1cdc8f5e8480da4b53e504cfb0a0d02. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9cdeb30b-578e-4b2b-b2b3-bc20d40b0f06.json and https://artists.proofprofile.net/proofs/artist/9cdeb30b-578e-4b2b-b2b3-bc20d40b0f06.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Paagla Majhi (Time-Tested Bengali Folk Songs)
Moyna Re Tore Aar Bhola Holo Koi (Original)