{
  "manageEntity": {
    "action": "Save",
    "entityId": "338660",
    "entityType": "Track",
    "nonce": "0x2fefccaed66c9296402c85bee3ef1d16d619d2db6aac36bd36e522b94ed4074b",
    "signature": "0xd77c33dcd82c4021230445ff0767f4f52909b813ec0acd4af14632588f1b5084646482ea49e16779d6e801e62f2c1a0d7090101cc300c4af1edf7b2a76cb0c5a1b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}