{
  "manageEntity": {
    "action": "Save",
    "entityId": "38917803",
    "entityType": "Track",
    "nonce": "0xb48fed806271b663f50134b2d0f89fe270c5b36b797820ee36a71a1c7fc6387c",
    "signature": "0xa242f7d966170fa334b5c08311e96d946ee18765336b30f36b083c047312b5ed6100f715fa4a8f334826b8ee97e34722448ca731b41925916b6107a16c25e9651b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}