{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x849ac07ffa7a9834f56e93d1ee6b9552090a3d23964cdd687cace3fbdf0cd070",
    "signature": "0xaa512484314ea20fb60c80dcd7a59a31b29f96b4659902e83876b1029ab74fc375862eeb2fd6054aef5ef6436226f708742b5a1d925f7b6ae650c097126b7e971c",
    "signer": "0x8C8dF31EaEF9d2E7e5e0C9Be2f1aD120dB9FE584",
    "userId": "328973860"
  }
}