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 0x28c8462889d5b4c47798d51fb2e6fd6c69265caf5c8b3de274effd55d0f3c7c1. 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/4d8df5c4-379d-4392-af76-d3eb47a6d5d8.json and https://artists.proofprofile.net/proofs/artist/4d8df5c4-379d-4392-af76-d3eb47a6d5d8.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
TVアニメ「ピアノの森」 Piano Selection I ショパン: エチュード ハ長調 作品10-1
TVアニメ「ピアノの森」 Piano Selection IV モーツァルト: ピアノ・ソナタ第2番 ヘ長調 K. 280 〜第1楽章
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 0xabc77e4b75c0c143225efd34040b8604dc91d34f5661a7c922f1fcf667b525cb. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/JPCO01806770 — a six-check JSON result.
TVアニメ「ピアノの森」 Piano Selection V 海ヘ (TVアニメ「ピアノの森」オープニングテーマ)
To the Sea ~ Opening Theme (Tv Animation "Piano No Mori" Piano Selection V)
TVアニメ「ピアノの森」 Piano Selection VII リスト: 「ラ・カンパネラ」〜パガニーニ大練習曲集 第3曲
Beethoven: Piano Sonata Nr. 14 Op. 27 Nr. 2 Cis-Moll "Quasi Una Fantasia" (arrange Version) (Tv Animation "Piano No Mori" Piano Selection VIII)
TVアニメ「ピアノの森」 Piano Selection VIII ベートーヴェン: ピアノ・ソナタ第14番 嬰ハ短調 作品27-2「月光」 〜第3楽章 (アレンジ・バージョン)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c316fa704d8dd86500764fbd0f727488414af3ea2466a3b268ef501b22388e. Chain 2 (Bitcoin): anchored in block 958045 (2026-07-14T18:53:23Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01811810 — a six-check JSON result.
TVアニメ「ピアノの森」 Piano Selection IX ショパン: エチュード ホ短調 作品25-5
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfa2b3a15ecfe746a7b61912525f24507e51f50ad48ee9ee577a8ce440decad. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01812510 — a six-check JSON result.
TVアニメ「ピアノの森」 Piano Selection XII ショパン: ノクターン第3番 ロ長調 作品9-3
TVアニメ「ピアノの森」Piano Selection ショパン: ポロネーズ第6番 変イ長調 作品53 「英雄」
TVアニメ「ピアノの森」一ノ瀬 海 至高の世界
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a32a9efed84edd30f5b7a3f9f5ba919fcb5310b89b7c1536ec413a277dcbb4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01904520 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f60bcd677ef9ea4660af6a1bbc311e2586b8c2df21bec118054cb6846d33a74. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01904470 — a six-check JSON result.
ピアノ協奏曲 第1番 ホ短調 作品11 第1楽章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20443d4b8052f6558e38dace963b66573095e351fa9778dae2ae438735d2b0f2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01904550 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e19e9a4525fda7e08c597ef1e320c072ae97a7a850b21393564a2e82d9babea. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01806440 — a six-check JSON result.
ピアノ協奏曲 第1番 ホ短調 作品11 第3楽章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc365840a41076e037b87277f9c78135ecbde38d9ba0c9723e9c8b3d6d29d45d3. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/JPCO01904740 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a7fa40d7d5db3364f7dad3395d655f08be342f31ee894ea194b862040d8432. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01813520 — a six-check JSON result.
ピアノ・ソナタ 第3番 ロ短調 作品58 第1楽章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd788b61f3759c3cf0c2237950c4f69b60919dfc142a5b1f9a12c51fa3884a1d2. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01904480 — a six-check JSON result.
ピアノ・ソナタ 第3番 ロ短調 作品58 第2楽章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a194940eff8da3c1293d143d73738548baa804568bb5201445b0c915aa03e6. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01904490 — a six-check JSON result.
ピアノ・ソナタ 第3番 ロ短調 作品58 第4楽章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff48503eceffa515f8658f7f4753a6289dab4a50a06ebd6d7594fb139dc00a2. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/JPCO01904510 — a six-check JSON result.
TVアニメ「ピアノの森」茶色の小瓶 (オーケストラver.)
TVアニメ「ピアノの森」茶色の小瓶 - オーケストラver.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e07fb8becba5fd4eda4621da23273b72658759992c06eac323cf1fbb3adfa9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01907030 — a six-check JSON result.