{
  "manageEntity": {
    "action": "Save",
    "entityId": "123887",
    "entityType": "Track",
    "nonce": "0xc32caa7f792af1e8e50d8f651b407adb95786d88113cd89abff725a90ee00cca",
    "signature": "0x4ff167efdbdf163052d14faec50f384f8daa7aef591af21d3b86cbeec06c575360d551abcce3b225e5c3f25ceab210ce2a980ead288e475c1aa3da5271caabb91c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}