{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xcdbf9f5fe8e15992e4c1f13272736396f9fa58c9cafb829c28ca3d8c135d79d8",
    "signature": "0x600bbebc7847494968c22007667653018217ed2a7d8dd2ba0cc57a6f637eb4ca58d49815523c6ac46ab5e64b37daedbb97b9653c85333dd9319384a64d4f78551c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}