Kassia
type: MusicGroup
genre: classical
genre: classical piano
description: Kassia, Cassia, Kassiane, or Kassiani (, ; – c.865) was a Byzantine-Greek composer, hymnographer and poet. She holds a unique place in Byzantine music as the only known woman whose music appears in t
popularity: 45
followers: 32354
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additional property: OTSVerifyInstructions
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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: 2026-06-12T19:24:56Z
album: Carol of the Bells
  type: MusicAlbum
  date published: 2020-01-04
  track: Carol of the Bells
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    by artist: Kassia
    in album: Carol of the Bells
      type: MusicAlbum
      date published: 2020-01-04
    genre: classical
    genre: classical piano
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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
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      date published: 2026-07-05T01:12:41Z
    audio: Carol of the Bells
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album: The Most Beautiful Classical Piano Music Vol. 1
  type: MusicAlbum
  date published: 2020-03-31
album: Once Upon a December (from Anastasia) [Arr. E. Pandolfi for Piano]
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  date published: 2020-04-07
album: Stranger Things Theme
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  date published: 2020-04-15
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    duration: PT2M52S
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      date published: 2020-04-15
    genre: classical
    genre: classical piano
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-05T01:12:41Z
    audio: Stranger Things Theme
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album: Libertango
album: Tico-Tico no Fubá
album: The Four Seasons: Summer (Presto)
album: Asturias
album: Ave Maria
album: Clair de Lune
album: Nocturne Op. 55 No. 1 in F Minor
album: Piano Concerto No. 21 - Andante
album: Waltz Op. 64 No. 2 in C-Sharp Minor
album: Ave Maria (Gounod)
album: Oblivion
album: Nocturne Op. 9 No. 2 in E-Flat Major
album: Ballade No. 1 in G Minor, Op. 23
album: Carmen: Habanera (Piano Solo Version)
album: Fly Me to the Moon (Piano Solo Version)
album: Prelude in G Minor, Op. 23, No. 5
album: Canon in D
album: Moon River (Arr. Mercuzio for Piano) [from Breakfast at Tiffany's]
album: Passacaglia (Sad & Emotional Piano Version)
album: Waltz of the Flowers from The Nutcracker (Piano Solo Version)
album: Czardas (Piano Solo Version)
album: Un Sospiro
album: Ode to Joy (Piano Solo Version)
album: Danse Macabre (Piano Solo Version)
album: Moonlight Sonata 1st Movement (Piano Sonata No. 14 in C-Sharp Minor, Op. 27, No. 2: I. Adagio sostenuto)
album: Dance of the Sugar Plum Fairy from The Nutcracker (Piano Solo Version)
album: Gymnopédie No. 1
album: Experience
album: Minuet in G Major (Attrib. J.S. Bach as BWV Anh. 114)
album: Prelude in C Major, BWV 846
album: Piano Sonata No. 16 in C Major, K. 545: I. Allegro
album: Symphony No. 9 in E Minor, Op. 95 “From the New World”: IV. Allegro con fuoco
album: Mariage d’Amour
album: River Flows in You
album: Rush E (Piano Solo Version)
album: G Minor Bach (from "Piano Tiles 2") [Sad & Emotional Piano Version]
album: Ballade pour Adeline (Piano Solo)
album: Now We Are Free (from "Gladiator") [Piano Solo Version]
track: Passacaglia, Suite No. 7 in G Minor, HWV 432/6 - Modern Piano Solo Version
track: Lacrimosa

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Loudness (dB)
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Key Name
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Mode Name
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G Minor Bach
type: MusicAlbum
date published: 2020-04-28

Libertango
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date published: 2020-05-11

Tico-Tico no Fubá
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date published: 2020-05-27

The Four Seasons: Summer (Presto)
type: MusicAlbum
date published: 2020-06-27

Asturias
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date published: 2020-08-06

Ave Maria
type: MusicAlbum
date published: 2020-08-11

Clair de Lune
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date published: 2020-08-13

Nocturne Op. 55 No. 1 in F Minor
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date published: 2020-12-03

Piano Concerto No. 21 - Andante
type: MusicAlbum
date published: 2020-12-08
track: Piano Concerto No. 21 - Andante
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  by artist: Kassia
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    type: MusicAlbum
    date published: 2020-12-08
  genre: classical
  genre: classical piano
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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
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    date published: 2026-07-03T08:56:35Z
  audio: Piano Concerto No. 21 - Andante
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Waltz Op. 64 No. 2 in C-Sharp Minor
type: MusicAlbum
date published: 2020-12-10

Ave Maria (Gounod)
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date published: 2020-12-11
track: Ave Maria (Gounod)
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    date published: 2020-12-11
  genre: classical
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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: 2026-07-13T17:43:59Z
  audio: Ave Maria (Gounod)
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Oblivion
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date published: 2020-12-12
track: Oblivion
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  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
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    date published: 2026-07-15T09:47:57Z
  audio: Oblivion
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Nocturne Op. 9 No. 2 in E-Flat Major
type: MusicAlbum
date published: 2021-02-17

Ballade No. 1 in G Minor, Op. 23
type: MusicAlbum
date published: 2021-02-20

Carmen: Habanera (Piano Solo Version)
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date published: 2021-02-22

Fly Me to the Moon (Piano Solo Version)
type: MusicAlbum
date published: 2021-02-26

Prelude in G Minor, Op. 23, No. 5
type: MusicAlbum
date published: 2021-03-31

Canon in D
type: MusicAlbum
date published: 2021-05-13

Moon River (Arr. Mercuzio for Piano) [from Breakfast at Tiffany's]
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date published: 2021-06-21

Passacaglia (Sad & Emotional Piano Version)
type: MusicAlbum
date published: 2021-07-08

Waltz of the Flowers from The Nutcracker (Piano Solo Version)
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date published: 2021-07-12

Czardas (Piano Solo Version)
type: MusicAlbum
date published: 2021-11-01

Un Sospiro
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date published: 2021-11-23

Ode to Joy (Piano Solo Version)
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date published: 2022-01-18

Danse Macabre (Piano Solo Version)
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date published: 2022-01-24

Moonlight Sonata 1st Movement (Piano Sonata No. 14 in C-Sharp Minor, Op. 27, No. 2: I. Adagio sostenuto)
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date published: 2022-01-28

Dance of the Sugar Plum Fairy from The Nutcracker (Piano Solo Version)
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date published: 2022-04-08

Gymnopédie No. 1
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date published: 2022-04-12

Experience
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date published: 2022-07-21

Minuet in G Major (Attrib. J.S. Bach as BWV Anh. 114)
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Prelude in C Major, BWV 846
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Piano Sonata No. 16 in C Major, K. 545: I. Allegro
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Symphony No. 9 in E Minor, Op. 95 “From the New World”: IV. Allegro con fuoco
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Mariage d’Amour
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River Flows in You
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Rush E (Piano Solo Version)
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G Minor Bach (from "Piano Tiles 2") [Sad & Emotional Piano Version]
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Ballade pour Adeline (Piano Solo)
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Now We Are Free (from "Gladiator") [Piano Solo Version]
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    date published: 2026-07-16T19:42:29Z
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Passacaglia, Suite No. 7 in G Minor, HWV 432/6 - Modern Piano Solo Version
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by artist: Johan Halvorsen
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genre: early-music
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genre: german-baroque
genre: choral
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-13T12:47:07Z
audio: Passacaglia, Suite No. 7 in G Minor, HWV 432/6 - Modern Piano Solo Version
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Lacrimosa
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duration: PT3M32S
duration ms: 212026
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by artist: Wolfgang Amadeus Mozart
by artist: Sigismond Thalberg
by artist: Kassia
in album: Lacrimosa
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genre: classical
genre: classical-era
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genre: opera
genre: chamber-music
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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
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  date published: 2026-06-13T13:32:09Z
audio: Lacrimosa
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