{
  "manageEntity": {
    "action": "Save",
    "entityId": "545855",
    "entityType": "Track",
    "nonce": "0xb6b4fe20c51c064a0b6a1a93daa2aa0714dca8883f5b3b3db59972a127a35a66",
    "signature": "0x1f7c72573553bd6ef0f0ca12ba643e7dc7e83e09fb99552d77c5f2caa9e3971e4f32df69cd7a2ad90a107347ddda9c847f4c37ee936d9a76f09e0239ce1771f81c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}