{
  "manageEntity": {
    "action": "Save",
    "entityId": "73433",
    "entityType": "Track",
    "nonce": "0xe96ad9c19e8e33d6d654af64c01528aa2051f983843c7320c209739661d8689d",
    "signature": "0x86ce3b4a24dba62b2f7ccc2e9a5be0a6fed7f848e18f2563636116d0a8059e722ad018db517a5f51f122806e87860bea6129cc124126441c2a7907bab2133eae1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}