Rashed Uddin Ahmed Topu (born 2 June 1982) popularly known as Topu is a Bangladeshi musician, singer-songwriter and composer as well as the lead vocalist of Yaatri. In 2004, Topu formed the band "Yaat
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 0xd32b82924546c85941813add00be660ef5de2602e262e05a226386fcb64786c8. 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/a5ccecf2-d92a-468f-a94c-9069e302e852.json and https://artists.proofprofile.net/proofs/artist/a5ccecf2-d92a-468f-a94c-9069e302e852.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 0xee4912003f6fa853f544691c67364132cc58562e9ca15d61a0583d5e6a73bc65. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRX282309074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f8537aa0b6c1f169a2190c1f7a0672fe959b3d5c31340b179fe5b86d9775be. 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/FRX282309075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91379fe768f4734ac8130970e653f0fd85c09daf9618a8046f6644b3062b2753. 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/FRX282309076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a7a41f2cf5f14dd84ec27e0a292c7a1553cf1174de0e7540b312528b5de239. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX282309077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b742794831b49b0fcc69d73d45964e6f71eb0f4b4c6c95a80094ff1ed3a238. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRX282309078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e02b49a955b53ae8c9c6adf9e38cef12309beb0ba301c5236a482f76369ae19. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRX282309079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3056ce70563b9e88c989a60a757218caea1c455d0bc7be877e2bb6469c4d6be4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FRX282309080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb829ebebf7c24281be859710f030017c13730559248fcb0c1b9f1dad03801389. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX282309081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319272eb47385d927a2d73b5784704bbc38a3130dab2ee09c412f8622dd1718c. 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/FRX282309082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17df17a40d6da0c42add2549a9dab41eb02461cdf5474078aaeef5e6ec7bf47. 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/FRX282309083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399355549e9c4fd5ce6d3239a7de9e9256c81335b3e1eda681391553df74849f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR2X42314292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765bfe0861061b2fffebe42aaaa948db54acea33be86c2e683ebfc041dd3627f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR2X42314293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749b1160bf12030194aa226964dcfa5feccd77e4be39e1c8b36280dd11be2927. 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/FR2X42314295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2007b186e60938279634b8e6a46a32e317c5632b333f876d6f7b0f25572a214. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR2X42314297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb090de68c9fe347ddedbf97b2b69d510c8f40a5602e5e0a2d81dd3c53ced2e68. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR2X42314300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81cc0cc6c0fbef24ae716220c98a4aa13ba940b0e5d9d5c9c28dce433f4c1e5e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR2X42314301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ce4bf8d7bcc037091f7a665654f3258d11da194aa38c225b43cfbfc93c87a2. 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/FRX282309055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1602d5aaa84f054f49ca56d7faa1c458cc780ab016a07a76b58305e1d4e698. 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/FRX282309058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010c5b6c3a0da70fd159268a8f03f67f1132a0e8d2cb6a7519432041b2c38760. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRX282309065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9687348d4dac4d2242b6a4438133cd6e29b56acc5d64888e365c536b4f08e066. 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/QZTBF2370437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002d9240df8dcd44375ace2d275f2ac423a4284f6b8c66155cb9dc2d7cf3e8d8. 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/DGA052352296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17dae26e10747a18c3947baa6afdfc8da0515e6f9a83313bd7f4da5d64a0d0c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:57:01Z), 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/DGA052352297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99757b2bb746df2a9bf003ee4bba07dd9ddb49913a4e1104d7c9ca70b306b228. 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/DGA092217305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a558ab19cb4039b1834e548f94df4fe3d46c32fd77a28cc8faa9a8bae1f251. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:33:58Z), 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/DGA052335995.