{
  "manageEntity": {
    "action": "Save",
    "entityId": "264981",
    "entityType": "Track",
    "nonce": "0x10907795e9abd057d5ceacf0ace6d409edf7e26b2d141f7bc093080d9c8b5365",
    "signature": "0x520baa94545fe0bb51829c9edcbe6eb6266cda7e5e4ec36a8da611677eae14c855d7a0ec3688378d794957ce5f3a047028ac1797a66026401995a52de185aee91c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}