東京大学サイバーフォレスト
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  value: 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
subject of: OpenTimestamps Proof of Existence
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album: Sounds of Nature Japan -Non-stop Recordings by Cyberforest-
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  date published: 2020-02-20
album: 24時間365日録り続ける自然音 ～大学が育むサイバーフォレストの地から～
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  date published: 2020-02-20
  track: 三陸 ひょうたん島 ～マイクの近くに集う鳥たち～
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-04T02:06:47Z
    audio: 三陸 ひょうたん島 ～マイクの近くに集う鳥たち～
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album: Rain Sounds -Soundscape Archives-
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  date published: 2020-04-24
  track: Birdsongs in the midst of winter rain -Chichibu Tetto-
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      date published: 2020-04-24
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-21T08:39:15Z
    audio: Birdsongs in the midst of winter rain -Chichibu Tetto-
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  track: Ghostly hour rain in summer forest -Yamanakako Lake, foot of Mt.Fuji-
  track: Singin' in the rain, black woodpecker -Furano, Hokkaido-
album: 雨の音 ～サイバーフォレストの音風景～

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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-05T04:47:21Z
audio: Ghostly hour rain in summer forest -Yamanakako Lake, foot of Mt.Fuji-
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Singin' in the rain, black woodpecker -Furano, Hokkaido-
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-19T20:05:23Z
audio: Singin' in the rain, black woodpecker -Furano, Hokkaido-
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雨の音 ～サイバーフォレストの音風景～
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date published: 2020-04-24
track: クマゲラと雨 ～富良野～
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-12T23:51:20Z
  audio: クマゲラと雨 ～富良野～
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