{
  "manageEntity": {
    "action": "Save",
    "entityId": "447947281",
    "entityType": "Track",
    "nonce": "0x4ef2c17650a1304a480c4e3e6b1895b655234437c5eb75628c657ff54bd0aa26",
    "signature": "0x8ed2b8076ca9b15de44943fbddae554cec42a62e670a728a7a797fb0453dc2b05395ed41009d75a8218fb1c7f0ccc3b503dda880e2b06baa99f3c86e179a8fb81c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}