(born February 4, 1966) is a Japanese singer and actress. She is signed to Victor Entertainment. Career In 1981, Kyoko Koizumi participated in and won the Star Tanjo! programme and released her firs
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 0x796ea461a39f903382482f69d499463ed803828e701928575cd8e35e46a10b08. 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/c6584c9b-85da-4507-8a70-0b2a0b37f420.json and https://artists.proofprofile.net/proofs/artist/c6584c9b-85da-4507-8a70-0b2a0b37f420.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
KKCP 90's ~TOUR 2023 Live at Spotify O-EAST~
KKPP - TOUR 2022 Live at Nakano Sunplaza Hall
コイズミクロニクル～コンプリートシングルベスト1982-2017～
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 0x17c4c74763334591f0324cef4d851fb40cff3e1a6de01d4b823467eaa0febe4a. 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/JPVI01315870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7cb4ed0931c053a9efdf6cf17d478b1d647d6e94fdd260d5f13c2d8f25ab8de. 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/JPVI01408140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6467456549a5321cbf7b0002c6fc8aeb0f5070d2313c5e716d509b2f9f7cfabd. 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/JPVI00834570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f497e1f95176802f14d4af44908e4f23033cf51395c105084e3f74d168eb6e. 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/JPVI00834580.
裏K25 ～KOIZUMI KYOKO ALL TIME BEST 19→38～
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8c44e16366c40b1b625ab97dee131e42ed1a4eee4154f86b82c453e54aefcc. 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/JPVI00309290.
快盗ルビイ（小泉今日子 & 大滝詠一デュエット・ヴァージョン）
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636ef34015abefba01a34a931df06f1eff95d74f4d1a11e1cbf2dc17ddaa28d3. 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/JPVI00243500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee7fa173019d1f80974dbb8f610b550bc02bd60d397b8f230cd8081a401187d. 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/JPVI09336490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed488460afea09ebab7e259ef7879ce06d8683a118e437dfa17cef66378a1ab. 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/JPVI09229350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd294e366224f66f90be14ab4c7efa3cfde9220b80814da08f9dd5973715cad26. 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/JPVI09430340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc51fe2dbd4600f3816313a78a2129ab5c58457f24bed997dfa13e3e9a6771d. 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/JPVI09109550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5fbf5d6cd5ce52fe3adb377de197df0486b6780f8e2dbecfaf0a704834ff525. 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/JPVI08902080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1039794520604fce22cb2e536409ce4b0c914daf71692ee209e29860565aac6. 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/JPVI08802080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc355b382f88aed300a080a412d5d4373e1bb50a9510d86cdd898b07b6b0e42c. 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/JPVI08802110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafea26cef1bf702f4347c8bfe6a3e424b41362de2c49326d36537944afd2f396. 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/JPVI08601110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e86087050da695ce09664cf11f64f51e50bfd1b1d6d742441c13174f5bba9e. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/JPVI08501690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe565dd44501318ef684e57aca5326b5d790a2bec6f51393f9763fb45dcbefb07. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-21T16:27:37Z), 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/JPB622000858.
Structure Of Romance (feat. Kyoko Koizumi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48f77d391e62a5aded8ffc352f543e6404d87e35a5510e50ddc20ded290e04b. 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/JPVI02300001.