{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5b27f53cf22f1776afd54494d223c1a16e2b65870da8412c25e8fb7f35b19ab1",
    "signature": "0xb81c1ab69d794ec61ca3efb2fd672cae2ceeebd05c21ea3ce13d2befe5cb1cd37ba045a29f45670711fc41074a7f38b18182f183925c2b6e131998816d0684741b",
    "signer": "0x55EB2C17C6ABEe82be1B3262Eda0168B8c523BAF",
    "userId": "33053609"
  }
}