{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xfaf9ca4ff7af3cb2cd12653462e629d980e98c428f2c16e354387a6e884a77e3",
    "signature": "0x8146ced621d90db8da667ed038d67be3666d171b291de0f48963438ae9c9127b39c42633f0034c792757e4da89a7554f789ed6e00eeb4b867107566aeac7d4691c",
    "signer": "0x90A9206Df4cA22A1ad24bfB7F1b639Aaa812Ac58",
    "userId": "266782887"
  }
}