Kumiko () is a feminine Japanese given name. Written forms Kumiko can be written using different kanji and can mean: 久美子, "forever, beauty, child" 空見子, "sky, see, child" 公美子, "public, beauty, child
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 0x35937aa5c4bf0a0b3268d9de316d1e5084a5ccba17b615f46947a33ae78b13dc. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/50bc363e-b9f1-43f1-b7be-3b8a46a16536.json and https://artists.proofprofile.net/proofs/artist/50bc363e-b9f1-43f1-b7be-3b8a46a16536.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
「届かなかったラヴレター」ソングブック
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 0xf39c7a6b45a31bc945718bbfa0e0f75a278d9a9e2036e8e5b5b2217257305140. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPB600976101 — a six-check JSON result.
アロング・ザ・ソングス ～この歌と歩いてきた～
美しい時代のうた 〜クミコ コロムビア カヴァーズ〜
私の好きなシャンソン Vol.2 〜シャンソンティックな歌たち〜
シャンソンティックな歌たち 〜「出逢い」が歌を運んだ〜