{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x618762caecb5f7afd300e2b9de8afdfa20517998293618762f8e454416d927bf",
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    "signer": "0x5442166ef935Ce2C48B7d89A27A0ADbFCA23fb3B",
    "userId": "572724018"
  }
}