貴族胎教音樂
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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
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  date published: 2026-06-20T19:15:05Z
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album: 鋼琴曲純音樂：嬰兒睡眠純音樂｜嬰兒催眠曲一聽就入睡
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  date published: 2022-12-20
  track: 晚安喵助眠（純音樂）
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      date published: 2022-12-20
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    additional property: OTSTimestamp
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    additional property: OTSVerifyInstructions
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-05T01:12:41Z
    audio: 晚安喵助眠（純音樂）
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