{
  "manageEntity": {
    "action": "Save",
    "entityId": "595222",
    "entityType": "Track",
    "nonce": "0x642ffee712eb4c3269470bd341721f5fe1c91a785aa0616fffee54c0fc5e8caa",
    "signature": "0xdaafc2854d34e10a823eaf66e692487fcf2c495d8dd984b59856b4419d9467df2f91f798a7148e87ef6435e210e39c6183ead640c8bde3426db75607162af5fa1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}