{
  "manageEntity": {
    "action": "Save",
    "entityId": "650625",
    "entityType": "Track",
    "nonce": "0x372da90f58fb060881f43f0714f0b673fc8d6295cd78dd77fd1e4ffc7d079ec3",
    "signature": "0x72b4a2ab25e201c607a01e82a17b9ea915ae5a599f90e328e93da32d236dff8f6c302ce1f66d3d6aa9b93cf097219329f0ac5b51ae8109dda9bbb13e406a8b8f1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}