{
  "manageEntity": {
    "action": "Save",
    "entityId": "550571",
    "entityType": "Track",
    "nonce": "0xa5a2843b4a5a37f3a5246e8d4dda51edbdc8fe96cb80a11c1fcdbd1329dbf36c",
    "signature": "0x109bb08be10d044690d6ec6db7262fcd7c0f989c6e7d0b33b1d18b5c102c8414087256f9ea0e5a4d46825db1ec46866530905094c5237e52ba36ec2abd3040911b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}