{
  "manageEntity": {
    "action": "Save",
    "entityId": "1690784951",
    "entityType": "Track",
    "nonce": "0xcbfd99336bb0ec2711ba14c3920ce8f02f38da070ef398491fb771787f141895",
    "signature": "0x69fc0290b8984235250ed2dbb89394a42a49c09437b520f54eb5f995a086817f38a9754bfef55ec0f24a1ef08e99dde3aaf751ae8860344438b5e476c12ea5c91c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}