{
  "manageEntity": {
    "action": "Save",
    "entityId": "2021234345",
    "entityType": "Track",
    "nonce": "0x9dac6b99d912453c7b5bd9442dd63e96207d95f2867e7f3cbb47df9caf406f48",
    "signature": "0x14c5bae9c59fb40257e5d37bd125c5a7c81e88e25e0773ffe8f686d07326fe5d4183457765bfa1105d52a417d748c3bee7c711c1c4390c6bbe9bfc1908de9d021c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}