John DeMain
type: MusicGroup
genre: opera
description: John DeMain is an American conductor who serves as music director of the Madison Symphony Orchestra in Wisconsin, as well as serving as artistic director of Madison Opera. He was music director and
popularity: 16
followers: 85
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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 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: 2026-06-15T15:41:00Z
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album: Porgy And Bess
  type: MusicAlbum
  date published: 1977
track: Porgy And Bess: Introduction and Jasbo Brown Blues
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  by artist: George Gershwin
  by artist: Dick Hyman
  by artist: Houston Grand Opera Ensemble
  by artist: John DeMain
  by artist: Houston Grand Opera
  in album: Porgy And Bess
    type: MusicAlbum
    date published: 1977
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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: 2026-07-02T03:55:08Z
  audio: Porgy And Bess: Introduction and Jasbo Brown Blues
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track: Porgy And Bess: Summertime
  type: MusicRecording
  duration: PT2M41S
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  by artist: George Gershwin
  by artist: Betty Lane
  by artist: Houston Grand Opera Women"s Ensemble
  by artist: Houston Grand Opera Orchestra
  by artist: John DeMain
  by artist: Houston Grand Opera
  in album: Porgy And Bess
    type: MusicAlbum
    date published: 1977
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-02T03:55:08Z
  audio: Porgy And Bess: Summertime
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Liveness
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Loudness (dB)
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Key Name
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value: B

Mode Name
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