{
  "manageEntity": {
    "action": "Save",
    "entityId": "639759",
    "entityType": "Track",
    "nonce": "0x9013f37ca0e8feedf8ed7de74426ffc8eae6ef4697fb30473f82572a6be49e7c",
    "signature": "0x0013f4b36d559169fcb75c52aec244692bb664929de4ba6c476d863283a2201d3482a3f662e2625993850a8307374cf7110b9c5a228c6757902cd84dc430e8401b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}