{
  "manageEntity": {
    "action": "Save",
    "entityId": "803117328",
    "entityType": "Track",
    "nonce": "0x56efe92f979cb3993fffa75922f7740753bd6cf2cb0007a47dc5317fc7f7fae6",
    "signature": "0xfb2dfeda4e10cb31b897b73a167fc1553b9397d45492ef324a0c3e366f0b5e82797d60f42f5248fec0e7cbf9303d7ec7896dbf5186102147f72729de0a52c9cb1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}