{
  "manageEntity": {
    "action": "Save",
    "entityId": "189027",
    "entityType": "Track",
    "nonce": "0xc10aad182c47f4c53950e643c882c53e75c626b0a5eb73fe8b3da0153d8aed10",
    "signature": "0xfb81c7ac60f5c5140bf5502caa07e2127b952dd2704cadb14d974483ee58c78834de7b8295e6d591236967884b8a41aa7d11c638ca902285e951c9e54afd07611b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}