{
  "manageEntity": {
    "action": "Save",
    "entityId": "941904881",
    "entityType": "Track",
    "nonce": "1792407417453672438",
    "signature": "0xad5cf0c4bbcebbc7563d2404d637dc57bf8528492779adc3700982849236659e51f8372add748bd80219a1fe1da3d44b639dceb090f3d720ed1427cb9f1304501c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}