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  track: Piano Concerto No. 1 in D Minor, Op. 15: Iii. Rondo (Allegro non troppo)
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  track: Polonaise No. 6, In AB Major , Op. 53
  track: Piano Concerto No. 2 in BB Major, Op. 83: Iv. Allegretto grazioso
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  track: Piano Concerto No. 23 in A Major, K. 488: I. Allegro
  track: Mazurka in C Minor, Op. 56 No. 3
  track: Piano Concerto No. 23 in A Major, K. 488: Ii. Adagio
  track: Piano Concerto No. 23 in A Major, K. 488: Iii. Allegro assai
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Piano Concerto No. 1 in D Minor, Op. 15: Ii. Adagio
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Piano Concerto No. 1 in D Minor, Op. 15: Iii. Rondo (Allegro non troppo)
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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: 2026-07-31T00:26:26Z
audio: Piano Concerto No. 1 in D Minor, Op. 15: Iii. Rondo (Allegro non troppo)
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Piano Concerto No. 2 in BB Major, Op. 83: Iii. Andante
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duration: PT12M19S
duration ms: 739600
explicit: false
by artist: Johannes Brahms
by artist: Arthur Rubinstein
by artist: Christoph von Dohnányi
by artist: Kölner Rundfunk-Sinfonie-Orchester
in album: Arthur Rubinstein Live, Vol. 1
  type: MusicAlbum
  date published: 2023-03-03
genre: classical
genre: german-romanticism
genre: classical-piano
genre: late-romantic-era
genre: chamber-music
genre: orchestral
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additional property: OTSVerificationAPI
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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: 2026-07-31T02:51:48Z
audio: Piano Concerto No. 2 in BB Major, Op. 83: Iii. Andante
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Polonaise No. 6, In AB Major , Op. 53
type: MusicRecording
duration: PT7M45S
duration ms: 465546
explicit: false
by artist: Frédéric Chopin
by artist: Arthur Rubinstein
in album: Arthur Rubinstein Live, Vol. 1
  type: MusicAlbum
  date published: 2023-03-03
genre: classical
genre: early-romantic-era
genre: polish-classical
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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 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: 2026-07-08T03:20:19Z
audio: Polonaise No. 6, In AB Major , Op. 53
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Piano Concerto No. 2 in BB Major, Op. 83: Iv. Allegretto grazioso
type: MusicRecording
duration: PT9M10S
duration ms: 550306
explicit: false
by artist: Johannes Brahms
by artist: Arthur Rubinstein
by artist: Christoph von Dohnányi
by artist: Kölner Rundfunk-Sinfonie-Orchester
in album: Arthur Rubinstein Live, Vol. 1
  type: MusicAlbum
  date published: 2023-03-03
genre: classical
genre: german-romanticism
genre: classical-piano
genre: late-romantic-era
genre: chamber-music
genre: orchestral
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additional property: OTSVerificationAPI
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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 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
  type: DigitalDocument
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  date published: 2026-07-08T03:20:19Z
audio: Piano Concerto No. 2 in BB Major, Op. 83: Iv. Allegretto grazioso
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Andante Spianato & Grand Polonaise Brillante Op. 22
type: MusicRecording
duration: PT14M4S
duration ms: 844880
explicit: false
by artist: Frédéric Chopin
by artist: Arthur Rubinstein
in album: Arthur Rubinstein Live, Vol. 1
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  date published: 2023-03-03
genre: classical
genre: early-romantic-era
genre: polish-classical
isrc code: CAAGN2219505
additional property: CopyrightID
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additional property: CopyrightRegisteredAt
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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 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
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b775967c7197f99b38cbb654f0b32e3478ee29be5e14948cf3ca4a533e382e7. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219505 — a six-check JSON result.
  date published: 2026-07-30T15:42:38Z
audio: Andante Spianato & Grand Polonaise Brillante Op. 22
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Piano Concerto No. 23 in A Major, K. 488: I. Allegro
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duration: PT10M51S
duration ms: 651600
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: Arthur Rubinstein
by artist: Paul Paray
by artist: Detroit Symphony
in album: Arthur Rubinstein Live, Vol. 1
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  date published: 2023-03-03
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
isrc code: CAAGN2219605
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additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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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 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
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe686ae1cd4be4bc0bc88ed5266ffa0a02894ac5935af56266607295851607644. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219605 — a six-check JSON result.
  date published: 2026-07-08T03:20:19Z
audio: Piano Concerto No. 23 in A Major, K. 488: I. Allegro
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Mazurka in C Minor, Op. 56 No. 3
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duration: PT5M26S
duration ms: 326320
explicit: false
by artist: Frédéric Chopin
by artist: Arthur Rubinstein
in album: Arthur Rubinstein Live, Vol. 1
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  date published: 2023-03-03
genre: classical
genre: early-romantic-era
genre: polish-classical
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additional property: CopyrightID
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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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 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
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9bcf27b143bce9323d7f5846cf05a8f6eecc45339c59e035cc85a4385b5213. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAAGN2219506 — a six-check JSON result.
  date published: 2026-07-31T12:24:41Z
audio: Mazurka in C Minor, Op. 56 No. 3
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popularity: 3
genre: classical
genre: german-romanticism
genre: late-romantic-era
genre: french-opera
genre: french-romanticism
genre: operetta
isrc code: USB8U1804618
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
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  value: 2026-07-30T14:32:24+00:00
additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0xb99bda6c18e13588ccad7e7b4ade81f3d55d6d7a74dbcae5cb53fca876f3278c
additional property: OTSHash
additional property: OTSBitcoinBlock
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  value: 960266
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960266
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804618
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T14:44:50Z
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99bda6c18e13588ccad7e7b4ade81f3d55d6d7a74dbcae5cb53fca876f3278c. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804618 — a six-check JSON result.
  date published: 2026-07-30T14:44:50Z
audio: Hoffmanns Erzählungen, 2. Act Schöne Nacht, du Liebesnacht
  type: AudioObject
  additional property: Tempo (BPM)
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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  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
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  additional property: Instrumentalness
    type: PropertyValue
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
    type: PropertyValue
    value: -19.869
  additional property: Key Name
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Hoffmanns Erzählungen: Es war einmal am Hofe von Eisenack
type: MusicRecording
duration: PT4M54S
duration ms: 294408
explicit: false
by artist: Jacques Offenbach
by artist: Kölner Rundfunkchor
by artist: Kölner Rundfunk-Sinfonie-Orchester
by artist: Rudolf Schock (Hoffmann) Chor
by artist: Ernst-august Steinhoff
by artist: Eugen Szenkar
in album: Hoffmanns Erzählungen (Hoffmanns Tales) Sung in German
  type: MusicAlbum
  date published: 2020-09-04
popularity: 2
genre: classical
genre: german-romanticism
genre: late-romantic-era
genre: french-opera
genre: french-romanticism
genre: operetta
isrc code: USB8U1804602
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T16:36:09+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xcd6001f62bcc0c0b1dc9860c4295364f09b2020c9b742b5e3bed0751d168a32a
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957118
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957118
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804602
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:20:19Z
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6001f62bcc0c0b1dc9860c4295364f09b2020c9b742b5e3bed0751d168a32a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804602 — a six-check JSON result.
  date published: 2026-07-08T03:20:19Z
audio: Hoffmanns Erzählungen: Es war einmal am Hofe von Eisenack
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 124.32
  additional property: Musical Key
    type: PropertyValue
    value: 2
  additional property: Mode (Major/Minor)
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    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.434
  additional property: Energy
    type: PropertyValue
    value: 0.182
  additional property: Speechiness
    type: PropertyValue
    value: 0.049
  additional property: Acousticness
    type: PropertyValue
    value: 0.939
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.107
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.067
  additional property: Loudness (dB)
    type: PropertyValue
    value: -19.555
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Major

Hoffmanns Erzählungen: He! Du da! Auf ein Wort, mein Sohn!
type: MusicRecording
duration: PT2M57S
duration ms: 177836
explicit: false
by artist: Jacques Offenbach
by artist: Kölner Rundfunk-Sinfonie-Orchester
by artist: Alexander Welitsch
by artist: Walter Kassek
by artist: Eugen Szenkar
in album: Hoffmanns Erzählungen (Hoffmanns Tales) Sung in German
  type: MusicAlbum
  date published: 2020-09-04
popularity: 1
genre: classical
genre: german-romanticism
genre: late-romantic-era
genre: french-opera
genre: french-romanticism
genre: operetta
isrc code: USB8U1804599
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T15:49:50+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xdfe4ff7de0218cf9012892a73eb600b219a24d2f4b645360b350fd4789c52759
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957145
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957145
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804599
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T08:56:20Z
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe4ff7de0218cf9012892a73eb600b219a24d2f4b645360b350fd4789c52759. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804599 — a six-check JSON result.
  date published: 2026-07-08T08:56:20Z
audio: Hoffmanns Erzählungen: He! Du da! Auf ein Wort, mein Sohn!
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 139.117
  additional property: Musical Key
    type: PropertyValue
    value: 1
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.53
  additional property: Energy
    type: PropertyValue
    value: 0.073
  additional property: Speechiness
    type: PropertyValue
    value: 0.092
  additional property: Acousticness
    type: PropertyValue
    value: 0.926
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.614
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.248
  additional property: Loudness (dB)
    type: PropertyValue
    value: -19.968
  additional property: Key Name
    type: PropertyValue
    value: C#
  additional property: Mode Name
    type: PropertyValue
    value: Major

Hoffmanns Erzählungen: Pfui, dieses Bier ist abscheulich!
type: MusicRecording
duration: PT6M18S
duration ms: 378592
explicit: false
by artist: Jacques Offenbach
by artist: Kölner Rundfunkchor
by artist: Kölner Rundfunk-Sinfonie-Orchester
by artist: Rudolf Schock (Hoffmann) Chor
by artist: Maria von Ilosvay
by artist: Ernst-august Steinhoff
by artist: Eugen Szenkar
in album: Hoffmanns Erzählungen (Hoffmanns Tales) Sung in German
  type: MusicAlbum
  date published: 2020-09-04
popularity: 1
genre: classical
genre: german-romanticism
genre: late-romantic-era
genre: french-opera
genre: french-romanticism
genre: operetta
isrc code: USB8U1804603
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-31T23:40:37+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x521dbcb773b0d6dae456cb48263a1b635e8088edd12a4e25df6d3620d74b98c0
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960481
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960481
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804603
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T23:51:35Z
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521dbcb773b0d6dae456cb48263a1b635e8088edd12a4e25df6d3620d74b98c0. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1804603 — a six-check JSON result.
  date published: 2026-07-31T23:51:35Z
audio: Hoffmanns Erzählungen: Pfui, dieses Bier ist abscheulich!
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 110.944
  additional property: Musical Key
    type: PropertyValue
    value: 8
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.395
  additional property: Energy
    type: PropertyValue
    value: 0.179
  additional property: Speechiness
    type: PropertyValue
    value: 0.196
  additional property: Acousticness
    type: PropertyValue
    value: 0.95
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
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    value: 0.313
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.115
  additional property: Loudness (dB)
    type: PropertyValue
    value: -21.214
  additional property: Key Name
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