{
  "manageEntity": {
    "action": "Save",
    "entityId": "738524903",
    "entityType": "Track",
    "nonce": "0xeac681864ddc71a21c0f845f6ca06899ffa1b8c9d2abd57783098bdb83269b48",
    "signature": "0xadd95aafaa8b13f12650cf24cccf2f07509ce06fcf9db76ca67c12bf2108c67d07e79b75c1e11734bc79aeae022f9eaf157a1a082b32e3896964bdc7ed6fe4d21b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}