Kalarab Shilpigosthi is a national Islamic cultural organization for children and teenagers in Bangladesh. It was founded in 2004 by Islamic musician Aynuddin Al Azad. As of June 17, 2021, Kalarab had
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 0x69a9dd374afed654bb6eb3181cd7ec95f04b9c0141089ff3aaa08e8c453a43ed. 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/9820f5f8-25a5-491d-968e-64455b2648a0.json and https://artists.proofprofile.net/proofs/artist/9820f5f8-25a5-491d-968e-64455b2648a0.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 0xef8bbb2bb705af9b91e1ec18c5377daf2d07fe7955d3a6c9eee4e885201df86b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DGA062370266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15dbce6487145abfdcf1b12d2b728e5ca219d662c22613a8d4ef66ecb05a853e. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/FR2X42481131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x494de4d6a9717c3e8b8b1591b8ff87abb40ddf64835ffdd3d81221c38c6dbfac. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/FR2X42447036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b8503cc197c7a7591962c2b4b98b7a91140fe018c9cd5dec1477b4cdf17bd9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FR59R2453989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67652ae15e51c5753c340b90580529b2f754f56954e198685056bd680a974f35. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZES82291436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39068a166daffcfaac4287146bd9b42ec485e2f09f8faf1bbbd79fbd1af4d97e. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZES82234485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3984c88dc88d6c591f7eb1f6666427dc5d3811ab5f124fa1ed57f0f3b1857846. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:15:21Z), 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/DGA062362764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9bf773e6db4af71bd38370f7d0c988a466ad508c6875a91e1d9f4a94a9f351. Chain 2 (Bitcoin): anchored in block 957919 (2026-07-13T23:58:45Z), 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/DGA0L2373979.