{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2d7bdaedf1fe56b8bb01aaf9c44609a76c5fbe2e388c6206d8b06f95ee49695c",
    "signature": "0x372423a1dd6bdb2f3320ba7f29a5e3d70682b7ac1c6291e7dacf220440d5634a3bae6c6e73c6b120228bbabfb6f1fa1eef2f753508597f383c1ad750f340a77c1b",
    "signer": "0x01500534dEA9F9d4bE087b2923047808c56C494d",
    "userId": "907127231"
  }
}