{
  "manageEntity": {
    "action": "Save",
    "entityId": "696356381",
    "entityType": "Track",
    "nonce": "0x7dfd3941c5e486d44114142ac8e3c5831c5a72ccdc5da6caa890dd54a622105b",
    "signature": "0x619e8a9cc57d238487287af9e27c2309e794e37178518779ee099d6a3ee91c2c3db5eb6544caaba4ba4a3e9ec06739af1608aeb90972a492e3227658659879c31b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}