{
  "manageEntity": {
    "action": "Save",
    "entityId": "387029394",
    "entityType": "Track",
    "nonce": "0xe4ea8c2056bf985071178a7fb673a97d5271720e3d64af0ab3e6dc7bbd7d154b",
    "signature": "0xf35b684ed94a84f6b019cbc74d9b8bc334fe44355d9107862ee9771e5106f1c85d90e88332fe855da2c0d59829585c8b290bb1d41863bf51a69920c06572dd471c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}