{
  "manageEntity": {
    "action": "Save",
    "entityId": "1390172563",
    "entityType": "Track",
    "nonce": "0xfd08fa1d81c9b5a4df74044e5694c00a28ac2642918f23e589f93c3961861b7d",
    "signature": "0x122929f13888048dce49cedccd97b29a20df93d39220380f194c50065f08e20945d811fdb732a5478b9948ca416fe9b3ccb2cba1d483908366bbe13d6114a5f11c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}