{
  "manageEntity": {
    "action": "Save",
    "entityId": "399599959",
    "entityType": "Track",
    "nonce": "0x3dabdf714034a2778dcb69fc7f9d5ae4f0814d80674ad987efe1f2e037853f74",
    "signature": "0x455543adb070ba00476737554b2a5b1fbbd27f25c5ce2d33a35a6c61c105ef3b07b72fd40d1212ec842aeb30c9703f13402922e01b0d54223b4ac367ff8f58131b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}