Rupankar Bagchi, also known mononymously as Rupankar, is a Bengali singer-songwriter, playback singer and actor from Kolkata, India. He has sung many famous songs in recent Bengali films like Chalo L
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 0x309160fcbb09a5142c45fdda709b7315c8e65327ed29cd7e8af9f9d2d15285cd. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/29a426f0-eb65-439d-aca3-8bc90d24773c.json and https://artists.proofprofile.net/proofs/artist/29a426f0-eb65-439d-aca3-8bc90d24773c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe583f4547b4afe9b10aff0a9a6259427baf88ce8c0f77ad0e756521c0edb89ae. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/INR191600212.
Rupankar Bagchi Bengali Movie Hits Part 2
Rupankar Bagchi Bengali Movie Hits Part 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda70c00ae89226b00f14c7eb1821693113df3b1c9740c745249a56b95395e89. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QMFME2064657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b138913a49166f597fb15be3fb8196232175d737b2e7921d71529dcb701935. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/INS931206552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e2c1fdd842a178d5cdf4cf2f3041be96ab7bf024bdc27f37d3c12dfc818dd9. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/INS931206550.
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 0x26f3a9f217b3648f52ebf19f3bbf0e0c75756625535d16a434689b8efaefb401. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/INS931206554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26120b5a884dffe1abdf08b4a45e6981f84b3a1a350ab09a04ead25df04ec1b4. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/INS931206553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1868087263ba1426b785315898d5b77ad7914dc72d038d7fd2f314a5967c283f. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/INS931206555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b57b0bad944dcc35fca71999a54a85a5261f47a6da574df3e86ec22e2b1ada. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/INS931206551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243ce4ae1a9c8d2699a16fda4e4718c57c34fba9eebac27fc6ae063368d9e07d. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/INS931206556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9052227966e00d4c914c35ac63bc05e55b3020e9b4376fd59b825b826b30e55. 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/INS931206558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c6ed8e52883673f6395db7c34d9a931390f523c13ccd9d5cd223168a24b48a. 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/QMFME2080861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5238462e507337865417327007feea9ff3b025f938604828e0c64797b620307. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QM4TW2106079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc298953ed452a5b0be072e586be5b02921d02f2db9108c1f017b6ae596b4b34. 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/QM4TW2106080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b6cc99fe29f42071b18e696134ab637144fb7536b9db2e1096081eb0c39f14. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QM4TW2106078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7a4535ef56d0e6ba0ec88e400ed12a3fbc79c1cb7c197e86d391fc9b12e788. 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/QM4TW2106083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1d48aa20630fc8f9ed3c0f5b19f3c49ff50920b2faa8d0c73ed8dc02179511. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/QM4TW2106084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212623e54dd508a3ecbf307abd2bb99943d62f6612924647620904b53ef02124. 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/INS3O1800250.
Batase Urche Abir Elo Holi (From "Alexander Er Pisi")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea0919e986c2549676b6dfd2d3aadb8aff5c1bbc02a22526c8edcd15249c0a6. 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/INS3O1800012.