{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x42e38154e8eae9fc7cc0ea26eecc41d228a2ae11c85421c370f9516c70a0fb76",
    "signature": "0xe5f0ca61ddb8d8c9b0d8e5a1e18a38ce41692bd883cf1fe651ebf52cbce7e7651db4e45b18677fa351ebbb041fe1782b6c3a22293bd9e70d28d7105e88dff1301b",
    "signer": "0x3Bf783b111463927F9b845D1F30c019A0B7967cd",
    "userId": "400600581"
  }
}