{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x1e514b7b1b4ef813c8db6116736c0feb002c8f52f63e7700d066fde552e4b8bf",
    "signature": "0x81f2c6ce312f3a29e4e0f6656cee026b4af38b99b5894d6255122f932556fb166b75634ed911cd823fc9969c30a5055ca935e59cc688262b099ede2644cb96ae1b",
    "signer": "0x7C634bc8303d9923BF5924Dc68bD6249Bb8bd551",
    "userId": "35078427"
  }
}