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 0x39b81b45171f1127c6fba8facefb0fd3f076150b15a2f0b3cdcc16715fba34f3. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7ab726e-b8fc-4d1c-8f57-c612fdcf568f.json and https://artists.proofprofile.net/proofs/artist/f7ab726e-b8fc-4d1c-8f57-c612fdcf568f.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 0x7d13b6f30b2bd6e517a8bdd01046efceb936bba5accbd15558f8b09dda1711b3. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/JPVI09103250.
Akiko Kanazawa / Populäre Musik aus Japan
東京音頭 平成ミックスアンド盆踊りミックス
J-POPS Dance Re-mix イエロー・サブマリン音頭（Remixed by SOICHI TERADA）
「必殺仕事人」挿入歌 みちのく流れ唄
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf4d83b71bb93ed591ba0033f82a77556cf7b95efcfb9a1da296d6408b82849. 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/JPVI07903790.
ゴールデン☆ベスト 金沢明子～民謡と演歌と
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54f164775b69d2250cfed6687a005b1cfb41115d06fa2ad17cfca344e16f961. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/JPVI01516660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf1a415e9d3ab8cdaebeb65aa97c00aece7dd61b2cabef1b12f40562796b965. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/JPVI01516600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe85716de5db4fc267482bb3a07bd25b35929686e6240978fc6b8402f4a98e5d. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/JPVI07903780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017d630d7df50740e816a2a26298e234e2cf1a4df289482af2ad96112d1117b8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/JPVI08203120.
金沢明子の民謡(4) 関西、中四国、九州、沖縄編
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4090b75f486a0960ff02bdd8608526815fb16a7e218b887e7f8e6c028d7b9a2. 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/JPVI07805100.
金沢明子の民謡(3) 関東甲信越、北陸、東海編