{
  "manageEntity": {
    "action": "Save",
    "entityId": "975781",
    "entityType": "Track",
    "nonce": "0x387fbf32ed8bffddc08c06486f4fba7255ea9f5d539635d0c31dd00ef9841b5d",
    "signature": "0xd662b39cb3ba15e1c69f38666dda899d94436db6a0aa723b2dec6cd277e610bc4fb5478b6b40543255f5cd7ac4249ad8c0fde95c003602aad528c85056b8ff5a1b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}