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    date published: 2026-07-08T03:22:41Z
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track: Léonin / Pérotin: Magnus Liber / Easter: Pascha nostrum immolatus (à 1) (Communion)
track: Léonin / Pérotin: Magnus Liber / Easter: Cristus resurgens - Dicant nunc (à 3) (Processional Antiphon)
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track: Léonin / Pérotin: Magnus Liber / Easter: Et valde mane una sabbatorum (à 2) (Matins responsory)
track: Léonin / Pérotin: Magnus Liber / Easter: Victimae paschali laudes (à 1) (Sequence)
track: Léonin / Pérotin: Magnus Liber / Feast of the Assumption of the Blessed Virgin Mary: Benedicta (à 3) - Virgo, Dei genitrix (à 3) (Gradual)
track: Léonin / Pérotin: Magnus Liber / Feast of the Assumption of the Blessed Virgin Mary: Alleluya - Assumpta est Maria (à 2) (Alleluya)
track: Léonin / Pérotin: Magnus Liber / Feast of the Assumption of the Blessed Virgin Mary: Beata es, virgo Maria (à 2) (Offertory)
track: Magnus Liber / Feast Of St. Stephen: Sederunt principes - Adiuva me, Domine (à 4) (Gradual)
track: Léonin / Pérotin: Magnus Liber / Feast of St. Stephen: Alleluya - Video celos apertos (à 2) (Alleluya)
track: Léonin / Pérotin: Magnus Liber / Feast of St. Stephen: Video celos apertos (Communion)

Léonin / Pérotin: Magnus Liber / Easter: Pascha nostrum immolatus (à 1) (Communion)
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  date published: 2026-07-08T03:53:27Z
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Léonin / Pérotin: Magnus Liber / Easter: Et valde mane una sabbatorum (à 2) (Matins responsory)
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by artist: Julian Clarkson
by artist: Westminster Cathedral Choristers
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  date published: 2026-07-30T06:39:12Z
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Léonin / Pérotin: Magnus Liber / Easter: Victimae paschali laudes (à 1) (Sequence)
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  date published: 2026-07-30T14:44:50Z
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Léonin / Pérotin: Magnus Liber / Feast of the Assumption of the Blessed Virgin Mary: Benedicta (à 3) - Virgo, Dei genitrix (à 3) (Gradual)
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7fc0ad81bb9a303827fce757bcef5ef1c4ee7b5b7d95d2cdda28dbd70fe04f. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/DEF059631805.
  date published: 2026-07-30T19:11:09Z
audio: Léonin / Pérotin: Magnus Liber / Feast of the Assumption of the Blessed Virgin Mary: Benedicta (à 3) - Virgo, Dei genitrix (à 3) (Gradual)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 93.921
  additional property: Musical Key
    type: PropertyValue
    value: 10
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.104
  additional property: Energy
    type: PropertyValue
    value: 0.184
  additional property: Speechiness
    type: PropertyValue
    value: 0.055
  additional property: Acousticness
    type: PropertyValue
    value: 0.959
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.035
  additional property: Liveness
    type: PropertyValue
    value: 0.08
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.14
  additional property: Loudness (dB)
    type: PropertyValue
    value: -23.71
  additional property: Key Name
    type: PropertyValue
    value: Bb
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: DEF059631805
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: 960296
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-30T19:11:09+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059631805
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960296
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960296
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T19:11:09+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

Léonin / Pérotin: Magnus Liber / Feast of the Assumption of the Blessed Virgin Mary: Alleluya - Assumpta est Maria (à 2) (Alleluya)
type: MusicRecording
duration: PT8M6S
duration ms: 486000
explicit: false
by artist: Léonin
by artist: Pérotin
by artist: Orlando Consort
by artist: Robert Harre-Jones
by artist: Stephen Charlesworth
by artist: Charles Pott
by artist: Michael McCarthy
by artist: Julian Clarkson
by artist: Westminster Cathedral Choristers
by artist: James O'Donnell
in album: Mystery Of Notre Dame
  type: MusicAlbum
  date published: 1997-01-01
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50dc9d588b7ff6b69b0cdf2edbd7dd5838d1c2e36437217d6359c4e31bbeb48. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEF059631806.
  date published: 2026-07-31T23:30:38Z
audio: Léonin / Pérotin: Magnus Liber / Feast of the Assumption of the Blessed Virgin Mary: Alleluya - Assumpta est Maria (à 2) (Alleluya)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 114.96
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.174
  additional property: Energy
    type: PropertyValue
    value: 0.183
  additional property: Speechiness
    type: PropertyValue
    value: 0.044
  additional property: Acousticness
    type: PropertyValue
    value: 0.873
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.189
  additional property: Liveness
    type: PropertyValue
    value: 0.059
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.075
  additional property: Loudness (dB)
    type: PropertyValue
    value: -20.673
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: DEF059631806
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: 960478
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T23:30:38+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059631806
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960478
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960478
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T23:30:38+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

Léonin / Pérotin: Magnus Liber / Feast of the Assumption of the Blessed Virgin Mary: Beata es, virgo Maria (à 2) (Offertory)
type: MusicRecording
duration: PT2M16S
duration ms: 136000
explicit: false
by artist: Léonin
by artist: Pérotin
by artist: Orlando Consort
by artist: Robert Harre-Jones
by artist: Stephen Charlesworth
by artist: Charles Pott
by artist: Michael McCarthy
by artist: Julian Clarkson
by artist: Westminster Cathedral Choristers
by artist: James O'Donnell
in album: Mystery Of Notre Dame
  type: MusicAlbum
  date published: 1997-01-01
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2183b268c6219b0f6e76de206e9e9ea92a95b2b5e4a148cf7cee1a8379c1dd37. 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/DEF059631807.
  date published: 2026-07-30T22:27:30Z
audio: Léonin / Pérotin: Magnus Liber / Feast of the Assumption of the Blessed Virgin Mary: Beata es, virgo Maria (à 2) (Offertory)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 108.262
  additional property: Musical Key
    type: PropertyValue
    value: 7
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.154
  additional property: Energy
    type: PropertyValue
    value: 0.213
  additional property: Speechiness
    type: PropertyValue
    value: 0.054
  additional property: Acousticness
    type: PropertyValue
    value: 0.972
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.001
  additional property: Liveness
    type: PropertyValue
    value: 0.096
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.129
  additional property: Loudness (dB)
    type: PropertyValue
    value: -19.926
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: DEF059631807
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: 960321
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-30T22:27:30+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059631807
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960321
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960321
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T22:27:30+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

Magnus Liber / Feast Of St. Stephen: Sederunt principes - Adiuva me, Domine (à 4) (Gradual)
type: MusicRecording
duration: PT16M22S
duration ms: 982000
explicit: false
by artist: Pérotin
by artist: Orlando Consort
by artist: Robert Harre-Jones
by artist: Stephen Charlesworth
by artist: Charles Pott
by artist: Michael McCarthy
by artist: Julian Clarkson
by artist: Westminster Cathedral Choristers
in album: Mystery Of Notre Dame
  type: MusicAlbum
  date published: 1997-01-01
genre: gregorian-chant
genre: medieval
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a38f872df1e8dc273529dd5ff740ca503c6a69de53bdb926eb1b637c0a906ee. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEF059631809.
  date published: 2026-07-31T10:20:10Z
audio: Magnus Liber / Feast Of St. Stephen: Sederunt principes - Adiuva me, Domine (à 4) (Gradual)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 98.811
  additional property: Musical Key
    type: PropertyValue
    value: 3
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.121
  additional property: Energy
    type: PropertyValue
    value: 0.268
  additional property: Speechiness
    type: PropertyValue
    value: 0.041
  additional property: Acousticness
    type: PropertyValue
    value: 0.913
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.52
  additional property: Liveness
    type: PropertyValue
    value: 0.2
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.177
  additional property: Loudness (dB)
    type: PropertyValue
    value: -20.361
  additional property: Key Name
    type: PropertyValue
    value: Eb
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: DEF059631809
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: 960389
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T10:20:10+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059631809
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960389
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960389
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T10:20:10+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

Léonin / Pérotin: Magnus Liber / Feast of St. Stephen: Alleluya - Video celos apertos (à 2) (Alleluya)
type: MusicRecording
duration: PT6M43S
duration ms: 403000
explicit: false
by artist: Léonin
by artist: Pérotin
by artist: Orlando Consort
by artist: Robert Harre-Jones
by artist: Stephen Charlesworth
by artist: Charles Pott
by artist: Michael McCarthy
by artist: Julian Clarkson
by artist: Westminster Cathedral Choristers
in album: Mystery Of Notre Dame
  type: MusicAlbum
  date published: 1997-01-01
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b29eae7bcd31db4e66550e160e3d9b4f825bc6d5cd19e075b8e0878193af70. 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/DEF059631810.
  date published: 2026-07-31T12:24:41Z
audio: Léonin / Pérotin: Magnus Liber / Feast of St. Stephen: Alleluya - Video celos apertos (à 2) (Alleluya)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 101.834
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 4
  additional property: Danceability
    type: PropertyValue
    value: 0.155
  additional property: Energy
    type: PropertyValue
    value: 0.15
  additional property: Speechiness
    type: PropertyValue
    value: 0.044
  additional property: Acousticness
    type: PropertyValue
    value: 0.886
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.047
  additional property: Liveness
    type: PropertyValue
    value: 0.068
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.125
  additional property: Loudness (dB)
    type: PropertyValue
    value: -22.57
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: DEF059631810
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: 960397
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T12:24:41+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059631810
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960397
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960397
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

Léonin / Pérotin: Magnus Liber / Feast of St. Stephen: Video celos apertos (Communion)
type: MusicRecording
duration: PT1M32S
duration ms: 92000
explicit: false
by artist: Léonin
by artist: Pérotin
by artist: Orlando Consort
by artist: Robert Harre-Jones
by artist: Stephen Charlesworth
by artist: Charles Pott
by artist: Michael McCarthy
by artist: Julian Clarkson
by artist: Westminster Cathedral Choristers
in album: Mystery Of Notre Dame
  type: MusicAlbum
  date published: 1997-01-01
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5963e34ef37f04033d97cc8b8341a74c753d56a62049526cadc1a90967b9e74a. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059631811.
  date published: 2026-07-31T09:09:19Z
audio: Léonin / Pérotin: Magnus Liber / Feast of St. Stephen: Video celos apertos (Communion)
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 108.534
  additional property: Musical Key
    type: PropertyValue
    value: 7
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 4
  additional property: Danceability
    type: PropertyValue
    value: 0.152
  additional property: Energy
    type: PropertyValue
    value: 0.161
  additional property: Speechiness
    type: PropertyValue
    value: 0.048
  additional property: Acousticness
    type: PropertyValue
    value: 0.978
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.099
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.104
  additional property: Loudness (dB)
    type: PropertyValue
    value: -19.404
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: DEF059631811
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: 960376
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T09:09:19+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059631811
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960376
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960376
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T09:09:19+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

Energy
type: PropertyValue
value: 0.227

Speechiness
type: PropertyValue
value: 0.049

Acousticness
type: PropertyValue
value: 0.953

Instrumentalness
type: PropertyValue
value: 0

Liveness
type: PropertyValue
value: 0.088

Valence (Positivity)
type: PropertyValue
value: 0.117

Loudness (dB)
type: PropertyValue
value: -20.336

Key Name
type: PropertyValue
value: C

Mode Name
type: PropertyValue
value: Major

Léonin / Pérotin: Magnus Liber / Feast of St. Stephen: Etenim sederunt principes (à 1) (Introit)
type: MusicRecording
duration: PT4M15S
duration ms: 255000
explicit: false
by artist: Léonin
by artist: Pérotin
by artist: Orlando Consort
by artist: Robert Harre-Jones
by artist: Stephen Charlesworth
by artist: Charles Pott
by artist: Michael McCarthy
by artist: Julian Clarkson
by artist: Westminster Cathedral Choristers
in album: Mystery Of Notre Dame
  type: MusicAlbum
  date published: 1997-01-01
isrc code: DEF059631808
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T08:04:21+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x5913ba8fb14caaa7decf3eff20ecf776a07bcf9614bfd5e1976070ab2e6d702d
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/DEF059631808
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5913ba8fb14caaa7decf3eff20ecf776a07bcf9614bfd5e1976070ab2e6d702d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059631808.
  date published: 2026-07-08T08:56:20Z
audio: Léonin / Pérotin: Magnus Liber / Feast of St. Stephen: Etenim sederunt principes (à 1) (Introit)
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  additional property: Tempo (BPM)
    type: PropertyValue
    value: 113.094
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
    type: PropertyValue
    value: 0.177
  additional property: Speechiness
    type: PropertyValue
    value: 0.054
  additional property: Acousticness
    type: PropertyValue
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  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.11
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.078
  additional property: Loudness (dB)
    type: PropertyValue
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  additional property: Key Name
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    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Minor