Ondřej Havelka
type: MusicGroup
genre: swing music
description: Ondřej Havelka (born 10 October 1954) is a Czech jazz and swing singer, actor, and director. He began his musical career singing with the jazz band Original Prague Syncopated Orchestra in 1976 and wen
popularity: 21
followers: 4215
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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
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-12T19:24:56Z
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album: Jazz & Hot Dance Music
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  date published: 1990-01-01
album: Stará, natoč gramofon
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  date published: 1993-01-01
album: Sám S Děvčetem V Dešti
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  date published: 2004-03-01
  track: Slunečnice
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      date published: 2004-03-01
    genre: swing music
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-18T04:13:26Z
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  track: Flašinetář
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      date published: 2004-03-01
    genre: swing music
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-18T15:39:25Z
    audio: Flašinetář
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album: Sám s děvčetem v dešti (+ bonusy)
album: Saturnin
album: Mesic to zavinil
album: Zivot je krasny
album: Pocta George Gershwinovi
album: Ondrej Havelka uvádí The Swings
album: Nejlepsi kusy z repertoaru (To nejlepsi z repertoaru)
album: Jen pro ten dnesni den [Live]
album: Platinum Collection
album: Krize sem, krize tam
album: Legendární gramofonové snímky z let 1976-89

Instrumentalness
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Liveness
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Valence (Positivity)
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value: 0.835

Loudness (dB)
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value: -15.479

Key Name
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value: G

Mode Name
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value: Minor

Sám s děvčetem v dešti (+ bonusy)
type: MusicAlbum
date published: 2004-03-01

Saturnin
type: MusicAlbum
date published: 2010-12-06

Mesic to zavinil
type: MusicAlbum
date published: 2011-01-07

Zivot je krasny
type: MusicAlbum
date published: 2011-01-07

Pocta George Gershwinovi
type: MusicAlbum
date published: 2012-08-17

Ondrej Havelka uvádí The Swings
type: MusicAlbum
date published: 2012-08-24
track: Dekuji, bylo to krasne
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    date published: 2012-08-24
  genre: swing music
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-04T11:19:20Z
  audio: Dekuji, bylo to krasne
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    additional property: Time Signature
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    additional property: Danceability
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    additional property: Speechiness
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track: Nebe na zemi
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    date published: 2012-08-24
  genre: swing music
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  additional property: OTSVerifyInstructions
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-16T16:14:30Z
  audio: Nebe na zemi
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Nejlepsi kusy z repertoaru (To nejlepsi z repertoaru)
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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
  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-05T19:27:56Z
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track: Jen pro ten dnesni den
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-13T23:58:45Z
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    additional property: Danceability
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    additional property: Valence (Positivity)
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track: Sam ja chodivam rad
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  subject of: OpenTimestamps Proof of Existence
  audio: Sam ja chodivam rad

OTSVerificationAPI
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OTSTimestamp
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value: 2026-07-06T01:25:57Z

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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e906089ddbe669f01c7615ea99fe0be1e5b6f2352c298373c362a43ce80a6d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CZA239900608.
date published: 2026-07-06T01:25:57Z

Sam ja chodivam rad
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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: Time Signature
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additional property: Danceability
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additional property: Energy
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additional property: Speechiness
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additional property: Acousticness
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additional property: Instrumentalness
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additional property: Liveness
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additional property: Valence (Positivity)
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additional property: Loudness (dB)
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additional property: Key Name
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additional property: Mode Name
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Jen pro ten dnesni den [Live]
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date published: 2012-09-21

Platinum Collection
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date published: 2013-07-26
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    type: MusicAlbum
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  genre: swing 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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc19787aeb817ed06f22be44b477e2fadf3016aa78d125bbefa277c360c2e4ae2. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/CZH810200034.
    date published: 2026-07-17T15:43:17Z
  audio: Hm, hm, ach ty jsi uzasna
    type: AudioObject
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    additional property: Musical Key
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
      type: PropertyValue
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    additional property: Danceability
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    additional property: Energy
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    additional property: Speechiness
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    additional property: Acousticness
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    additional property: Instrumentalness
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    additional property: Valence (Positivity)
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Krize sem, krize tam
type: MusicAlbum
date published: 2014-10-13

Legendární gramofonové snímky z let 1976-89
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date published: 2019-11-22
track: Ghost of the blues
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    type: MusicAlbum
    date published: 2019-11-22
  genre: swing music
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  additional property: CopyrightStatus
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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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
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    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787592d8978e19e62a32b78d540a50f0c3345ca0080cc7d990678494c86afe3e. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CZA168000759.
    date published: 2026-07-04T11:19:20Z
  audio: Ghost of the blues
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    additional property: Mode (Major/Minor)
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    additional property: Danceability
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    additional property: Valence (Positivity)
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track: He's the Last Word
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    type: MusicAlbum
    date published: 2019-11-22
  genre: swing music
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  additional property: CopyrightID
  additional property: CopyrightStatus
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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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6388a9fd08ddbf7239c13bc526dcc3d422b8a4305dd822dd43b050d8c048e3cf. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CZA168484996.
    date published: 2026-07-04T10:04:33Z
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    additional property: Musical Key
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    additional property: Mode (Major/Minor)
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    additional property: Danceability
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