{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x1959b598aed65e8efd818d2f3972a55cb1e04b5b3ea72f7cada56c87268bdf2c",
    "signature": "0x3d160680a69993a7a6eb36afbdf8d3f113d8f52c70420c958912634691096d490b738ac2cb6302fb82d99d62f71f7bbb6d15e06bd84ff8a3dd2de13b7c64bb231c",
    "signer": "0x5d53d29E5ceD9dc145d66c14925ED873D7B972B4",
    "userId": "127609009"
  }
}