{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb829e8253a586dcdbdab2b9c8933a34c3b646bbc880ca945adc0e6e4dbb3b397",
    "signature": "0xa71f90363be160e374881fdf5994779778044b9c135c166f16f6868efb3343cf7a49fd824cc54a4df316788328e9519d89ee23ec117db67834d331b2360932af1b",
    "signer": "0x93d644eefb5feeF93eBE368C654Ed96CdB115B85",
    "userId": "299033199"
  }
}