{
  "manageEntity": {
    "action": "Save",
    "entityId": "340291589",
    "entityType": "Track",
    "nonce": "0x56a68e51657388c5cccf72fa6c7a85e3f41e25043477899b689b23a1aeddd9e0",
    "signature": "0x599d759cc8568187451ac1828e2ad8b3a1a97a4e41a8454b9c7b6935f43a3aa63acefc25ec3b5230982f7acd74e8134c3e2230dfc087f04af619c5f838b625f81c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}