{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa3221e51b6e44f93995db64ca9a8d57e24ca0907c8288aeb5f750b4f1518408d",
    "signature": "0xe133b8afe068bdfce59bbfee4e41461a6c117f096d5a74b7156065fd7ea4831b54d26cabb5e09183441665dd48c7f439a7e6b5074eae509dd71b510c9ce495fe1b",
    "signer": "0x1FAF3C6ab652411A004DdcF812Aee9dEB0d7Cc74",
    "userId": "395353709"
  }
}