Felix Langgard
type: MusicGroup
popularity: 31
followers: 119
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xdfddf511bd2a83f6c808871e13d42eb15fc11f93c323627ced4e2fee5ebd60a5
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953407
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953407
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f8807823-dd3f-4294-8c09-dec68d1264e9.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/f8807823-dd3f-4294-8c09-dec68d1264e9.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/f8807823-dd3f-4294-8c09-dec68d1264e9
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-12T19:24:56Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xdfddf511bd2a83f6c808871e13d42eb15fc11f93c323627ced4e2fee5ebd60a5","name":"Felix Langgard","registered_at":"2026-06-12T14:03:49Z","symbol":"NIM0319856","token_address":"0x1b22b4d177b7384a31d066553983cc9773429a73","type":"artist","uuid":"f8807823-dd3f-4294-8c09-dec68d1264e9"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  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
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfddf511bd2a83f6c808871e13d42eb15fc11f93c323627ced4e2fee5ebd60a5. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8807823-dd3f-4294-8c09-dec68d1264e9.json and https://artists.proofprofile.net/proofs/artist/f8807823-dd3f-4294-8c09-dec68d1264e9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T19:24:56Z
  text: {"copyright_id":"0xdfddf511bd2a83f6c808871e13d42eb15fc11f93c323627ced4e2fee5ebd60a5","name":"Felix Langgard","registered_at":"2026-06-12T14:03:49Z","symbol":"NIM0319856","token_address":"0x1b22b4d177b7384a31d066553983cc9773429a73","type":"artist","uuid":"f8807823-dd3f-4294-8c09-dec68d1264e9"}
album: Langeland
  type: MusicAlbum
  date published: 2021-02-22
album: Fyn
  type: MusicAlbum
  date published: 2021-06-09
  track: Fyn
    type: MusicRecording
    duration: PT3M4S
    duration ms: 184477
    explicit: false
    by artist: Felix Langgard
    in album: Fyn
      type: MusicAlbum
      date published: 2021-06-09
    isrc code: SE6RB2167301
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-05T05:06:06+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x20d3881e5e0bbc25f63eea19e591c647064f220168ab0e0456ec0615c7a3037d
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956776
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956776
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE6RB2167301
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-05T10:59:37Z
    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 0x20d3881e5e0bbc25f63eea19e591c647064f220168ab0e0456ec0615c7a3037d. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/SE6RB2167301.
      date published: 2026-07-05T10:59:37Z
    audio: Fyn
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 74.677
      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: 0.08
      additional property: Energy
        type: PropertyValue
        value: 0.2
      additional property: Speechiness
        type: PropertyValue
        value: 0.043
      additional property: Acousticness
        type: PropertyValue
        value: 0.321
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.952
      additional property: Liveness
        type: PropertyValue
        value: 0.105
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.032
      additional property: Loudness (dB)
        type: PropertyValue
        value: -20.926
      additional property: Key Name
        type: PropertyValue
        value: F
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Nyord
  type: MusicAlbum
  date published: 2021-12-19
  track: Nyord
    type: MusicRecording
    duration: PT2M51S
    duration ms: 171600
    explicit: false
    by artist: Felix Langgard
    in album: Nyord
      type: MusicAlbum
      date published: 2021-12-19
    isrc code: SE6ZX2169901
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-19T19:40:53+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x42a748b359129053709fc53fb2fdf9a346abaad0bb31bb01c7e2bc220f76ba2b
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958774
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958774
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE6ZX2169901
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-19T22:43:08Z
    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 0x42a748b359129053709fc53fb2fdf9a346abaad0bb31bb01c7e2bc220f76ba2b. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:43:08Z), 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/SE6ZX2169901.
      date published: 2026-07-19T22:43:08Z
    audio: Nyord
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 70.272
      additional property: Musical Key
        type: PropertyValue
        value: 7
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 1
      additional property: Danceability
        type: PropertyValue
        value: 0.178
      additional property: Energy
        type: PropertyValue
        value: 0.069
      additional property: Speechiness
        type: PropertyValue
        value: 0.048
      additional property: Acousticness
        type: PropertyValue
        value: 0.847
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.836
      additional property: Liveness
        type: PropertyValue
        value: 0.111
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
album: Hærvejen
album: Assens
album: Lyngsø

Valence (Positivity)
type: PropertyValue
value: 0.038

Loudness (dB)
type: PropertyValue
value: -26.509

Key Name
type: PropertyValue
value: G

Mode Name
type: PropertyValue
value: Major

Hærvejen
type: MusicAlbum
date published: 2022-05-18

Assens
type: MusicAlbum
date published: 2022-11-12

Lyngsø
type: MusicAlbum
date published: 2023-06-11