{
  "manageEntity": {
    "action": "Save",
    "entityId": "573477424",
    "entityType": "Track",
    "nonce": "0xeecc8dd30fdac368745b5a7f8bcae67fdbab5119249308311e411a9037a30e3f",
    "signature": "0x5b2ca84faa07257794b3bea4c82cf85da451ce0fe3bdd8aabda803ff8b425c0c7d2075dd6be153acaf34ed5ba1b60889bc63a050833ff6c8b4a2343e8f2679841b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}