{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x841891e3b979828e1cdaf1c902666d7b6462f0b52d33271d3583e1588a9ebd19",
    "signature": "0x48666a3655cf2c8f31e9ef7de04e58e8345c7a7a31f15351a995bd32aea598535f05adbe04b331de792ed418fe52823a060747decb04cea0f02c3b006079d3cc1c",
    "signer": "0x596d9c0D94863358Abd03BA6f7d42c506a51D159",
    "userId": "450084402"
  }
}