Sumargleðin
type: MusicGroup
description: Sumargleðin (English: The Summer Joy) were an Icelandic entertainment group that was active in the late 1970s and early 1980s. It was founded in 1972 by Ragnar Bjarnason and Ómar Ragnarsson. It produc
popularity: 16
followers: 595
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x751b464023c6cd3963c37686747fc67922ec3220179212ecb06454bd7a8cb843
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953741
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953741
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9fc09c23-41f6-4c3f-ad87-d9c7f49e50da.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9fc09c23-41f6-4c3f-ad87-d9c7f49e50da.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9fc09c23-41f6-4c3f-ad87-d9c7f49e50da
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T04:44:49Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x751b464023c6cd3963c37686747fc67922ec3220179212ecb06454bd7a8cb843","name":"Sumargleðin","registered_at":"2026-06-14T21:17:31Z","symbol":"NIM0579190","token_address":"0x9134fa6f69fc7647f614b421912bd0b9e989a24d","type":"artist","uuid":"9fc09c23-41f6-4c3f-ad87-d9c7f49e50da"}
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 0x751b464023c6cd3963c37686747fc67922ec3220179212ecb06454bd7a8cb843. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9fc09c23-41f6-4c3f-ad87-d9c7f49e50da.json and https://artists.proofprofile.net/proofs/artist/9fc09c23-41f6-4c3f-ad87-d9c7f49e50da.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T04:44:49Z
  text: {"copyright_id":"0x751b464023c6cd3963c37686747fc67922ec3220179212ecb06454bd7a8cb843","name":"Sumargleðin","registered_at":"2026-06-14T21:17:31Z","symbol":"NIM0579190","token_address":"0x9134fa6f69fc7647f614b421912bd0b9e989a24d","type":"artist","uuid":"9fc09c23-41f6-4c3f-ad87-d9c7f49e50da"}
album: Sumargleðin syngur
  type: MusicAlbum
  date published: 1981
album: Sumargleðin syngur
  type: MusicAlbum
  date published: 1981-01-01
  track: Prins Póló
    type: MusicRecording
    duration: PT4M41S
    duration ms: 281983
    explicit: false
    by artist: Sumargleðin
    in album: Sumargleðin syngur
      type: MusicAlbum
      date published: 1981-01-01
    isrc code: ISA110903103
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-18T18:00:14+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x8d28d2fcf6b837b58fd255a2c2da8b7e99cd636fcd6d58dffba63a94dc8443b3
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958601
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958601
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ISA110903103
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-18T19:27:02Z
    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 0x8d28d2fcf6b837b58fd255a2c2da8b7e99cd636fcd6d58dffba63a94dc8443b3. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/ISA110903103.
      date published: 2026-07-18T19:27:02Z
    audio: Prins Póló
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 139.695
      additional property: Musical Key
        type: PropertyValue
        value: 1
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.696
      additional property: Energy
        type: PropertyValue
        value: 0.676
      additional property: Speechiness
        type: PropertyValue
        value: 0.096
      additional property: Acousticness
        type: PropertyValue
        value: 0.116
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.781
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.66
      additional property: Loudness (dB)
        type: PropertyValue
        value: -9.606
      additional property: Key Name
        type: PropertyValue
        value: C#
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Sumargleðin syngur
  type: MusicAlbum
  date published: 1981-01-01
album: Af einskærri sumargleði
  type: MusicAlbum
  date published: 1984-01-01
album: Af einskærri sumargleði
  type: MusicAlbum
  date published: 1984-01-01