{
  "manageEntity": {
    "action": "Save",
    "entityId": "893172554",
    "entityType": "Track",
    "nonce": "0xa22c7517c21615a9ed1daa84137731b56d562f28d08339af05587549d49892b0",
    "signature": "0x548ef5e3cd6da43feb9395a486f28c45d7701dd4d4bb0f49ba8d4e8775260d122237f353943189eb03bb1b40b1d215a78e095b31247e08c46a653c95c73014511b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}