{
  "manageEntity": {
    "action": "Save",
    "entityId": "1455978009",
    "entityType": "Track",
    "nonce": "0x65d5255554d50b000e21cb14d22f85b202dd8f11cd08b2e3c17e1de172000eff",
    "signature": "0x38fdc61b1b07db064927aa835f04ecf2f01ce1ac06eaa6f1c4fa70c9d9ab063859ca604b2b36bf5590c222bdf1b41892aaf288182b784e7629a877a44cde9c2a1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}