Marc Bauer
type: MusicGroup
genre: chamber music
genre: neoclassical
description: Marc Bauer (born May 28, 1975, Geneva, Switzerland) is an artist best known for his works in the graphic medium, primarily drawing. Life and career Marc Bauer studied at the Ecole supérieure d’art
popularity: 6
followers: 1
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-16T13:28:01Z
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track: Histoire du Soldat, Pt. 1: "Voilà un joli endroit..."
track: Histoire du Soldat, Pt. 1: Marche du soldat (reprise)
track: Histoire du Soldat, Pt. 1: Petits airs au bord du ruisseau (suite)
track: Histoire du Soldat, Pt. 1: Marche du soldat
track: Histoire du Soldat, Pt. 1: Petits airs au bord du ruisseau
track: Histoire du Soldat, Pt. 1: "Donnez-moi votre violon..."
track: Histoire du Soldat, Pt. 1: Pastorale
track: Histoire du Soldat, Pt. 2: Marche du soldat (reprise)
track: Histoire du Soldat, Pt. 2: Marche royale
track: Histoire du Soldat, Pt. 2: Petit concert

Histoire du Soldat, Pt. 1: "Voilà un joli endroit..."
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duration: PT0M52S
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by artist: Igor Stravinsky
by artist: Carole Bouquet
by artist: Guillaume Depardieu
by artist: Sergio Azzolini
by artist: Daniel Breszynski
by artist: Michel Cerutti
by artist: Shlomo Mintz
by artist: Vincent Pasquier
by artist: Pascal Moraguès
by artist: Marc Bauer
in album: Stravinsky: Histoire du Soldat
  type: MusicAlbum
  date published: 1997
isrc code: FRZ139610510
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additional property: OTSTimestamp
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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
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T08:56:20Z
audio: Histoire du Soldat, Pt. 1: "Voilà un joli endroit..."
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Histoire du Soldat, Pt. 1: Marche du soldat (reprise)
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duration: PT1M46S
duration ms: 106160
explicit: false
by artist: Igor Stravinsky
by artist: Sergio Azzolini
by artist: Daniel Breszynski
by artist: Michel Cerutti
by artist: Shlomo Mintz
by artist: Vincent Pasquier
by artist: Pascal Moraguès
by artist: Marc Bauer
in album: Stravinsky: Histoire du Soldat
  type: MusicAlbum
  date published: 1997
isrc code: FRZ139610540
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additional property: OTSTimestamp
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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
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subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8cbdacf3af4880f365f2df863d50f40f2d33b1bd353a3119fa417eb523c900e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ139610540.
  date published: 2026-07-08T03:22:41Z
audio: Histoire du Soldat, Pt. 1: Marche du soldat (reprise)
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  additional property: Valence (Positivity)
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  additional property: Key Name
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Histoire du Soldat, Pt. 1: Petits airs au bord du ruisseau (suite)
type: MusicRecording
duration: PT0M49S
duration ms: 49640
explicit: false
by artist: Igor Stravinsky
by artist: Sergio Azzolini
by artist: Daniel Breszynski
by artist: Michel Cerutti
by artist: Shlomo Mintz
by artist: Vincent Pasquier
by artist: Pascal Moraguès
by artist: Marc Bauer
in album: Stravinsky: Histoire du Soldat
  type: MusicAlbum
  date published: 1997
isrc code: FRZ139610600
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  type: PropertyValue
  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
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:39:04Z
audio: Histoire du Soldat, Pt. 1: Petits airs au bord du ruisseau (suite)
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Histoire du Soldat, Pt. 1: Marche du soldat
type: MusicRecording
duration: PT1M46S
duration ms: 106893
explicit: false
by artist: Igor Stravinsky
by artist: Sergio Azzolini
by artist: Daniel Breszynski
by artist: Michel Cerutti
by artist: Shlomo Mintz
by artist: Vincent Pasquier
by artist: Pascal Moraguès
by artist: Marc Bauer
in album: Stravinsky: Histoire du Soldat
  type: MusicAlbum
  date published: 1997
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T19:35:34Z
audio: Histoire du Soldat, Pt. 1: Marche du soldat
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additional property: OTSVerifyInstructions
  type: PropertyValue
  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

Histoire du Soldat, Pt. 1: Petits airs au bord du ruisseau
type: MusicRecording
duration: PT2M33S
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explicit: false
by artist: Igor Stravinsky
by artist: Sergio Azzolini
by artist: Daniel Breszynski
by artist: Michel Cerutti
by artist: Shlomo Mintz
by artist: Vincent Pasquier
by artist: Pascal Moraguès
by artist: Marc Bauer
in album: Stravinsky: Histoire du Soldat
  type: MusicAlbum
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subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7df34b239c25a3231d85f2fa29360c723bb99c1aa91e935a9945bde296753b5. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ139610520.
  date published: 2026-07-30T17:41:38Z
audio: Histoire du Soldat, Pt. 1: Petits airs au bord du ruisseau
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additional property: OTSVerifyInstructions
  type: PropertyValue
  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

Histoire du Soldat, Pt. 1: "Donnez-moi votre violon..."
type: MusicRecording
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duration ms: 231400
explicit: false
by artist: Igor Stravinsky
by artist: Carole Bouquet
by artist: Gerard Depardieu
by artist: Sergio Azzolini
by artist: Daniel Breszynski
by artist: Michel Cerutti
by artist: Shlomo Mintz
by artist: Vincent Pasquier
by artist: Pascal Moraguès
by artist: Marc Bauer
in album: Stravinsky: Histoire du Soldat
  type: MusicAlbum
  date published: 1997
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T02:19:15Z
audio: Histoire du Soldat, Pt. 1: "Donnez-moi votre violon..."
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  additional property: Acousticness
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  additional property: Instrumentalness
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isrc code: FRZ139610530
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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additional property: OTSVerificationAPI
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additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  type: PropertyValue
  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

Histoire du Soldat, Pt. 1: Pastorale
type: MusicRecording
duration: PT2M51S
duration ms: 171733
explicit: false
by artist: Igor Stravinsky
by artist: Sergio Azzolini
by artist: Daniel Breszynski
by artist: Michel Cerutti
by artist: Shlomo Mintz
by artist: Vincent Pasquier
by artist: Pascal Moraguès
by artist: Marc Bauer
in album: Stravinsky: Histoire du Soldat
  type: MusicAlbum
  date published: 1997
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2812715cb5d84f3ceeaeffc848697e1fae381ac87dfbc2f6c34de8bdc4f43b4b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ139610560.
  date published: 2026-07-31T12:24:41Z
audio: Histoire du Soldat, Pt. 1: Pastorale
  type: AudioObject
  additional property: Tempo (BPM)
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  additional property: Musical Key
    type: PropertyValue
    value: 7
  additional property: Mode (Major/Minor)
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    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
    type: PropertyValue
    value: 0.988
  additional property: Instrumentalness
    type: PropertyValue
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  additional property: Liveness
    type: PropertyValue
    value: 0.096
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.052
  additional property: Loudness (dB)
    type: PropertyValue
    value: -32.788
  additional property: Key Name
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    value: G
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isrc code: FRZ139610560
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ139610560
additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
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additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T12:24:41+00:00
additional property: OTSVerifyInstructions
  type: PropertyValue
  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

Histoire du Soldat, Pt. 2: Marche du soldat (reprise)
type: MusicRecording
duration: PT1M39S
duration ms: 99893
explicit: false
by artist: Igor Stravinsky
by artist: Sergio Azzolini
by artist: Daniel Breszynski
by artist: Michel Cerutti
by artist: Shlomo Mintz
by artist: Vincent Pasquier
by artist: Pascal Moraguès
by artist: Marc Bauer
in album: Stravinsky: Histoire du Soldat
  type: MusicAlbum
  date published: 1997
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965da4f7319b22f138d631d28ca8279647c07dfb42436161bbeb68440611019a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ139610610.
  date published: 2026-07-30T22:27:30Z
audio: Histoire du Soldat, Pt. 2: Marche du soldat (reprise)
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  additional property: Tempo (BPM)
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  additional property: Musical Key
    type: PropertyValue
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.795
  additional property: Energy
    type: PropertyValue
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  additional property: Speechiness
    type: PropertyValue
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  additional property: Acousticness
    type: PropertyValue
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  additional property: Instrumentalness
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  additional property: Liveness
    type: PropertyValue
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  additional property: Valence (Positivity)
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    value: 0.442
  additional property: Loudness (dB)
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isrc code: FRZ139610610
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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additional property: OTSVerificationAPI
  type: PropertyValue
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
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additional property: OTSTimestamp
  type: PropertyValue
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additional property: OTSVerifyInstructions
  type: PropertyValue
  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

Histoire du Soldat, Pt. 2: Marche royale
type: MusicRecording
duration: PT2M42S
duration ms: 162400
explicit: false
by artist: Igor Stravinsky
by artist: Sergio Azzolini
by artist: Daniel Breszynski
by artist: Michel Cerutti
by artist: Shlomo Mintz
by artist: Vincent Pasquier
by artist: Pascal Moraguès
by artist: Marc Bauer
in album: Stravinsky: Histoire du Soldat
  type: MusicAlbum
  date published: 1997
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752b1ca89274c6c66cea8bd88e3bbcfd0beb56f849550ba2a94581ab4d46f9a2. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ139610630.
  date published: 2026-07-30T12:45:34Z
audio: Histoire du Soldat, Pt. 2: Marche royale
  type: AudioObject
  additional property: Tempo (BPM)
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    value: 127.065
  additional property: Musical Key
    type: PropertyValue
    value: 5
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.802
  additional property: Energy
    type: PropertyValue
    value: 0.225
  additional property: Speechiness
    type: PropertyValue
    value: 0.044
  additional property: Acousticness
    type: PropertyValue
    value: 0.952
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.934
  additional property: Liveness
    type: PropertyValue
    value: 0.084
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.742
  additional property: Loudness (dB)
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  additional property: Key Name
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isrc code: FRZ139610630
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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additional property: OTSVerificationAPI
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSTimestamp
  type: PropertyValue
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additional property: OTSVerifyInstructions
  type: PropertyValue
  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

Histoire du Soldat, Pt. 2: Petit concert
type: MusicRecording
duration: PT2M57S
duration ms: 177933
explicit: false
by artist: Igor Stravinsky
by artist: Sergio Azzolini
by artist: Daniel Breszynski
by artist: Michel Cerutti
by artist: Shlomo Mintz
by artist: Vincent Pasquier
by artist: Pascal Moraguès
by artist: Marc Bauer
in album: Stravinsky: Histoire du Soldat
  type: MusicAlbum
  date published: 1997
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea0e2b37fe065347a51253b95f8dc22a7fdec1db716c6437f81230085254556. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ139610650.
  date published: 2026-07-31T20:42:35Z
audio: Histoire du Soldat, Pt. 2: Petit concert
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 131.471
  additional property: Musical Key
    type: PropertyValue
    value: 2
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.667
  additional property: Energy
    type: PropertyValue
    value: 0.186
  additional property: Speechiness
    type: PropertyValue
    value: 0.051
  additional property: Acousticness
    type: PropertyValue
    value: 0.981
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.719
  additional property: Liveness
    type: PropertyValue
    value: 0.097
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.786
  additional property: Loudness (dB)
    type: PropertyValue
    value: -21
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: FRZ139610650
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 960463
additional property: BitcoinTime
  type: PropertyValue
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additional property: OTSVerificationAPI
  type: PropertyValue
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
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additional property: OTSTimestamp
  type: PropertyValue
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additional property: OTSVerifyInstructions
  type: PropertyValue
  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