Raghab Chattopadhyay, also spelled as Raghav Chatterjee is an Indian Bengali singer. He mainly sings Bengali modern songs, Rabindra Sangeet and Nazrul Geeti. He has also worked as a playback singer in
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 0x942227b021b695244726378161c9be3b925bfd0fa212c7f138ee6942174c9e8c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d8cde5f-d375-42f3-af42-7ef4c4f792f3.json and https://artists.proofprofile.net/proofs/artist/9d8cde5f-d375-42f3-af42-7ef4c4f792f3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xa6bf103fdbf3a3ff67a6ee0799a1fb11666ae1cf08e7bf80f91969b319173215. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INH101103325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f265fa3f8db6ec22a980d5b4a778d9b77c19594d4020a9ea0c896612e282f6c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INR192000321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2cb8c56438f7d516bbb4d500714bff645a1bbb8cd3e7025ed02348c24f279c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INR192000322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb311f8fcb5b5e52af97f7ede06737d2240fd37935d6eb8b6c403cc0183751377. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INR192000323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4833842f0c3b1a00cfa19a014cc022aadd738aae11ac6ce5727e16f389e187. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1771949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd536b5c99b9d0e8435f0a247a45e84a63db79e04260579f47cc8da96c65f28bc. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1771952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de45663e337ee0d8538b41ddbece43d71a5fb5ed6524bd6dfcbc46632ff7868. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2X41752981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c83693cd75ff56abc63e2f550480b0c54da41d6749533aed86eb1d9de1390c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2X41752982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535027f4957f729f5b6a9be1cd5fd058557e0e598a450f9b0456833ceeae8e96. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2X41752983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75a833c513e7f41863f01d835090343df488ac2bc2e8656f9d6528e38fc52d3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2X41752984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07869534579f6c5694affc89b7d535475875a24ce93f825feee5874ff529988. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INE182569533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7520a6bcdbc0bfc8673e4c8c3b5ffddcc642cd0fbb6358a32f9360dfa32b680. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INJ252500022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x288c1b44e90a4eab991ce7ddf105acc5507eebff5591e0389f9086b84d7ab527. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CBEYJ2411777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f3db344394d45025b531c4c4e4fc8dbff47158bf0ca4bb5c982004475b7fce. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INR3P2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95d5a2228d33b91bf6c951fdfb57c7e171dbbf51e8127b66f3b0a3b38854310. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INR1R2318229.