{
  "manageEntity": {
    "action": "Save",
    "entityId": "1354019326",
    "entityType": "Track",
    "nonce": "0x5e55f7b4be1fe52f8adf7ee22661b9d6c84954be9357c0835954b0345209ee4c",
    "signature": "0x5c9beb152633f6543610d6f39b8a1b91e695c1de38c5d9da628bd5f2af876e9a63cc4a617998426f1aa75e4ca66f35ce09897aff009cabfec92502fe5757889f1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}