{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa5fe94e676a939c0ca483c45cb69d1fe1e254cebcbde663f1ccd37eed0b08a49",
    "signature": "0xbe65ffb8c13cac63225e474a7154206b28aaead4e71712b933d478a8b30bfda0752e79d2174311baae3a09db0669b684acf7d3527123f5a256dbcfe2a0ca40f01b",
    "signer": "0x4d4139541BC11156cD0290eaabf053F3D00b4704",
    "userId": "433912365"
  }
}