{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf0c92aab4402e58309cd059e777b5b94c15ce9e57459260883aa4f6f11a0ca9a",
    "signature": "0xa930e5d673cce5b809d905c8e30ac71e6d39d6485caf454ed13e60a3cefa58364e30b84aba6aec6f97ca68750086d73b07a50a7891eddaf6d00eaf82c7c5eeb01b",
    "signer": "0xc2866e2a73cc1f91d6F5c62287152F2394D1979D",
    "userId": "216678909"
  }
}