{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb968c9ab2039e0f131cf7c5ef0ae66a5031e03f93565349b16495397feffc97f",
    "signature": "0xe896b45a30e6db75942e6a2760709b2785c8f3cd7b9fa2c27ddc3762a4479961559c255f9123feb79ca587e4898c5b11003c300f88eeec61e9e93ec2ea48ee471b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}