{
  "manageEntity": {
    "action": "Save",
    "entityId": "78566",
    "entityType": "Track",
    "nonce": "0x7daf004d7ba016543601a50423e66ce3e53a6cca736232b857d935a74d1fb7a2",
    "signature": "0x68df53cff92d6443d8a6bf034ad6c9e7651f9d7c08f906c41870a7ed32b760d54c88ed226e51aa06a6c3db1aa40f7d57be97298a5af906c7e3c33c88e6fc39431b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}