{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0103c4ba553d8fa1901516c2473df9dd5a0e083e3dbb186a49c67a732a57758e",
    "signature": "0x97e3bf2f40f8f9ba28eb8245cc1fa4daea635ffdf0d10019c5a894c6941b5aab542f7f8bdd54b5680e494553bf93f8ecaed8f4f190b6c8501bd8587d78415c6d1b",
    "signer": "0xf3DD91912C819414c9D62Ba2c7abFF8adde8c542",
    "userId": "132265812"
  }
}