Oblique Strategies
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description: thumb|Packaging of Oblique Strategies Oblique Strategies (subtitled Over One Hundred Worthwhile Dilemmas) is a card-based method for promoting creativity jointly created by musician/artist Brian Eno a
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followers: 213
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album: Raw Pastiche
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    by artist: Mr Brown
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-30T09:37:10Z
    audio: Bar Cardio
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-08T03:22:41Z
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  track: Houdini Method
  track: Numbers Up
album: Silhouette

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Houdini Method
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additional property: OTSVerifyInstructions
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  value: 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
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:22:41Z
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Numbers Up
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-08-01T00:40:43Z
audio: Numbers Up
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Silhouette
type: MusicAlbum
date published: 2022-11-14