{
  "manageEntity": {
    "action": "Save",
    "entityId": "489610",
    "entityType": "Track",
    "nonce": "0xfcccbefca1a5f178cbcd7224a666be83422e6f0c4d9b5da0acc79b2c4640451e",
    "signature": "0x1c7f8c746053f4672a6e26d9772098e22df18e92aa5e327dcbfa4880e9d1b39d08a88fe4142948080944eff9064846f911a756ca311e9b1759a4f8c6148cf5ba1c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}