{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x39319bf4f428d7ba3cf9b5125d3de43b41dcb780615fa6177f051ac2617f1957",
    "signature": "0xd7760dd5f906070d9c8a8dca864eddc85880fae2816250ea50585b6fa1e85b540952b41fe9cb0047210934d58a9cfe399cfbac3a0327b8be386fa55d32949c7c1c",
    "signer": "0x3F058EE3eBF068c1141Fdd4d8b15571E21eCD247",
    "userId": "666300703"
  }
}