{
  "manageEntity": {
    "action": "Save",
    "entityId": "1399446388",
    "entityType": "Track",
    "nonce": "0x90965195d3d52747eab4c3cb040d8b24dcdaa6ae66b2bc17f90bb85cf3824547",
    "signature": "0xdfab5abbf157f7724cf55e49b76f26663a31e6cb9104dcace1e1fb19533456166b4602bfb8decf9668b18dd7c4ed1aa5db6868571ba0dd1717cdad99c7964b111c",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}