{
  "manageEntity": {
    "action": "Save",
    "entityId": "431515248",
    "entityType": "Track",
    "nonce": "0x76c7bb31aa2e6ebb472bfaa38ff8bda55261f49b7215d6ed39efe21e07da9475",
    "signature": "0x46eab473a0fb16b7efc57165ca74b9aadda5633b545480df4b3ce74c78c3eb84262805907520996dbf11f5087a8d28db73f6fbe8f5f177a0b2f0ef7548c263871b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}