{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8a57136480f7811ee9b7802829acecb7b988c1afbe0d45ed613aa66d492745ee",
    "signature": "0xe25f5cd4fd02dd1b13f1c5266c6b1050e62e1a83a9d32537234cf50cf82d45211cc4e024ec92f08fdf3b3009ddefc7f2fe0663b66f54fece4f89068240b881401b",
    "signer": "0xF277776C87fae0004d160528Ed671bFf5156a147",
    "userId": "844253107"
  }
}