{
  "manageEntity": {
    "action": "Save",
    "entityId": "521330105",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd723fe4f9572efab2d9adf888765ae7fde87293998be25ddf0e70ecff49f13ea",
    "signature": "0x63f50e4439a0e6bab2f708319ddff89250b3ab6a14944ee6c1a595a5b6a1d633395acce60518082061fd41cf988593f45012107f6960ada3fde92c9502f3f0041b",
    "signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
    "userId": "370091516"
  }
}