{
  "manageEntity": {
    "action": "Save",
    "entityId": "431017152",
    "entityType": "Track",
    "nonce": "0x88e523b07ca1d84b5538673824c268489e936d4a2cf3f8d3e51f9d0af9c98ff6",
    "signature": "0x4537c03ff2b681a5a4cd3bf87437c0578b53d36f1f2a2218b61a96b6c280fe937ff4ef4e2b69869dac1d5d9d118efedca8ca2a84630cd328daa6d87970690ba51c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}