{
  "manageEntity": {
    "action": "Update",
    "entityId": "594647240",
    "entityType": "Playlist",
    "metadata": "{\"cid\":\"\",\"data\":{\"playlist_contents\":[{\"timestamp\":1788240364,\"track_id\":121304412}]}}",
    "nonce": "1788240364797071544",
    "signature": "0x268577227793b4bf0325cce2ae3066e93f7154bf84596afacde3bf08d390b6677c56f7f329f8e81ac6109dd37364c947f369788106fc99728d71cc64ea9190251c",
    "signer": "0x922cb2AE695da9f7Dd0e556954c23eeeb8bfFe0E",
    "userId": "664531520"
  }
}