{
  "manageEntity": {
    "action": "Save",
    "entityId": "571489",
    "entityType": "Track",
    "nonce": "0x12fbc7d0f994729e5550c7be061f86dae9560411380b03f3bf26824c46b03aa3",
    "signature": "0x00a2d4abb1aabe207442da8366cfa52a296a63741c62af19e896b06cb8c2ee281500edd03685ce3fd66a292d8cbbb6c1390fb6c678cef6068d15f4129334bf541b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}