{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4a15a9ab95ba86798c14ebc8da418838d8651c3b611eca287f21dcc051fc6a5d",
    "signature": "0xbe59b02cb87f3303913a4731a5d3cd0367eb9090707fdf18f8b9d347de9e3e560ac872cfb5331e776751aac03dccb0db345c660d929b68698ae5cfc46c8ad0e51b",
    "signer": "0xcc9e1E88B008675950B42831dBBAB89396f1d8c3",
    "userId": "373466917"
  }
}