{
  "manageEntity": {
    "action": "Save",
    "entityId": "724455",
    "entityType": "Track",
    "nonce": "0x5c707c424918f24d31be519a87b0ea5b94b9eb32551672f53d0a1884288febe3",
    "signature": "0x72a64d9cac880b1041f35f1cb9f2309c2b559c3544084e8694e2843d9066c28b5585adf96b3f73c9b4d3947424e5a9428f86e4aa2a79c0adadc5d98c943767521b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}