{
  "manageEntity": {
    "action": "Save",
    "entityId": "150303",
    "entityType": "Track",
    "nonce": "0x13117f4a6806a0bd4378d44c0a223b523cb646f9d60cb6366060c3df40f884d4",
    "signature": "0x30a2176a5f942b79053017cde4a7e0e15653caaadae600cbbb93430c6830798109dfa99077e93724454168f7794e62cdd61df1547487a2e128dd71caee8f160d1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}