{
  "manageEntity": {
    "action": "Save",
    "entityId": "987484",
    "entityType": "Track",
    "nonce": "0x380f31735c7dcecfc62616effa9893b556111471310c36578182d6a0af0dbeb0",
    "signature": "0x905be9adcfac7bdbc9402142be02c794b5d38f5d201f72561f18b162bc70e30d698792b9b25db9d8f8575f1769616b9a7d29af7fc1c45d950686f8b001fe94a21b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}