{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4f12ab809d1c682c6b8cb27f493755465c78966b51a08cb02792e6ebf546730a",
    "signature": "0x5995f62d9ca92d4a2c2c503ec7feac835e9c8ac9759553a7a3d064deb9b81df67b0c0a8630b85ed4a571fec323b38353575662eda788d60d0acda0af7e3b73891b",
    "signer": "0x74321dDf2b3fEA747CfE0c9C08426d3D7964e9f1",
    "userId": "123128424"
  }
}