{
  "manageEntity": {
    "action": "Save",
    "entityId": "890315599",
    "entityType": "Track",
    "nonce": "0xa901d0cc3f22ee639f113fcf5f54ea36b94fa69d3373de59cb7d3f5620ea1a3e",
    "signature": "0x76a581fbce5eebf50d8ba5a039edca7fc3482a1895e499bc5aefccc81e225e667fde4044160f757d52c16afff3e8fe8c80a9e76ae6680cadc93489a13c4025b21b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}