is a Japanese four-piece rock band formed in Fukuoka, Japan. The band consists of Yuji Kurokawa (vocals and guitar), Shohei Koga (guitar), Yudai Tanaka (bass), and Takahiro Ono (drums). Biography
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 0xd70bbec0f16b8acdf87c2bf346ea4e6a8b075862881f860d8eca673b754a64aa. 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/1511ea89-39a1-4b51-8d62-06f8d0c20fd7.json and https://artists.proofprofile.net/proofs/artist/1511ea89-39a1-4b51-8d62-06f8d0c20fd7.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 0x6d8967d6f01793e480bc1b6b2382c8b768813f17ec48809465508b534f78367c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/JPG101800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x796517f3b7b04074db23b777c0f155e6fd6e8530736841aabb66b255a203c8f4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPG101800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4633dc60c01f6f198e2e8ca8556c6f023c5dfa6ce8fe2ab9c861ab5ecaf06ea4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/JPG101800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f0ae914906456fef0d15a55a3a13eb750ef0855873c2a39434ebd89211b26dd. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPG101800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9cd871901a95296447c00e93482f59245b237645b77034ae4114d7e5cb52e0. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/JPG101800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8f374937232a9147b5e730a3d7a66e937b093fa03a715f31f26095b1991ba8. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/JPG101800145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8af0a690b57871d1ef61b14b5a5861ad4f42935c91df472ad7c42582d977f4b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/JPG101800147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17387125e817956b72ca8411752abe3c30a07d5654cbefd4b20112047381083d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPG101900455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb0014e831e206face8020ed07461d63141dc086ebed9475a6f1d49e63a212d. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/JPG101900457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d855504071453139e292092708b41f2f0e5ceb409df7c23a4b44c98c991a734. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/JPG101900459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24bbc0beca1bddb9db95fd63755bee7227b9712164321519d38f711c799fd7ff. Chain 2 (Bitcoin): anchored in block 957579 (2026-07-11T14:35:38Z), 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/JPG102000731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225281a4f18254fb8ac2bc46184bacf82b166a24f888493446cbbd34ba1c6bfc. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/JPG102000733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd746834062515c601914d80f1c3c3ffdd9ca936280907e9a7448a4dfed262d. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/JPG102000734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f120e2ed2fe3471e55c882ce8698247b747b1873d039f64852a3fdb8716535. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/JPG102101021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7b02f336fa916f7eebefea07ee36083b63c08e798824f6fefc8c826cd90554. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/JPG102101018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a1433e4a6a2d5d12d84e7eba388e9639f9bd9889a3b0b199cde312b3006e3f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/JPG102100311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed35488074e900a96a29701fbc2c5435ee1bf507fc31d9dfbeee9bfa9d7413ae. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/JPG102101023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2433746059ad40c91a1be9137d9b076f5f79460e1eef0bccae57c8509e715577. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/JPG102101024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9dae34c2f5e8772ade2a9d7d044f6b43b504aca29c276f3fb9c670229b96627. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/JPG102101025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522a5d23e7397f2b4e32f759e404be1963e948afd394b139dff281155f4faca1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPG102101026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0396a246b65c746efcd6c39623fc908781d67ba1f8017cfcb1f9500761a89e93. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/JPG102201031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9461ce949d485295faa8d5b5c10cabfd3429f3cfb3a0f457423071cc69383a89. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPG102201430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa198c03d9fa54097b6ba26592511d82172957ddb8dafb64b9f6015af37699b07. 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/JPG102301742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc9af019746fb00a4a2f5fab01c99ee3e75fee16e18c1b672edea88f78bc0e50. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/JPG102301743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f671730ee341a2eb8766259e8b77b420876d4bfd06ea7330a0ce414c53f8a3. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/JPG102301745.