{
  "manageEntity": {
    "action": "Save",
    "entityId": "669184487",
    "entityType": "Track",
    "nonce": "0xbd11738f9e2b301cd6005d54b0ea1644468a548822649b42460790e7e1707a79",
    "signature": "0xe94ac6877878b3c3e5df92d436f06463eed212373cf47ee5078873ed9669a4bd57e9af4686c99931431a6125e154e7bd0379df20b663eb3bb0efabe6ccac7f261c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}