{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xcec7c4104fd3fd023cb13f37e8fc78a1f1eea3b77a13cf6b148e0ec11151e62e",
    "signature": "0xbbf5e63a7fa923adeb7135927cfe4e950408a87f59ed8ad50de83e8229e3d15a04703c1431c97817492608af8c51cc4f8153453b96f468fb9442ebe212fd325a1b",
    "signer": "0x1523C2bDc77CB5d624d3C9b45C74D41322C6a5b1",
    "userId": "759537297"
  }
}