{
  "manageEntity": {
    "action": "Save",
    "entityId": "732869",
    "entityType": "Track",
    "nonce": "0xa7a7c3eecf5879dee6d52e99e525b92fc1698a20a8a21dc4dc59f369839560a4",
    "signature": "0xe83f81a14bf0a0dddeb4c7c0afe5aebe895dc2533a3199cfa3e65991b6e78a535a394aea6d5d81a6ec8c698d18cd9c813d1587ad06ed5bbd05e4d7c72317e2581b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}