{
  "manageEntity": {
    "action": "Save",
    "entityId": "2020870632",
    "entityType": "Track",
    "nonce": "0x7704c8f8c4d4d6c8f2c3e9acbb0ae8003ad0a7783e89ba392136419fc85863e6",
    "signature": "0x4201d3acf8feb75a7261cfbd283c04754c45aeb67f341fefa782beb8cb76237f090896e3c94e9847ad1bd7c515469fc0dabc641dc63efa19743826df8976fa051c",
    "signer": "0x669C207e15A757a751fd8f623DFf054C6D3D0b05",
    "userId": "121458"
  }
}