{
  "manageEntity": {
    "action": "Save",
    "entityId": "1849539432",
    "entityType": "Track",
    "nonce": "0x9b0039d6dde273469c4c3946de6d3a43670b66cf7d856e0e9dc389d9381b6eb1",
    "signature": "0x0c8340981e4ca3c9439da1f0a323c228c2bd8e5fdf1c66bbbdd63c146c3db0012548a59ea5975f968f7a8ad93c87be1bba3592834f87c2d7da4518c83e549b2a1c",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}