{
  "manageEntity": {
    "action": "Save",
    "entityId": "539893136",
    "entityType": "Track",
    "nonce": "0xebab752910993ad7e56e785a39f165b88f0114e2c625fb2e7ba023dcab3af34a",
    "signature": "0xb996084561d8a3ed38da18095e840ed7ff8ba80b0028f0577fc093c2ea809f0e17079d1fa0112ce750214db1dbb20395b073a6213560a1899cb8754e42bbed8c1c",
    "signer": "0x6358b8242b9C42F729C56E53d43D1Ff02984a51A",
    "userId": "422362002"
  }
}