{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x89b0cc5303c1a488933b7f0b618be8ce307cc45a58fc436558278d421c87d2cb",
    "signature": "0xd8d13e71e33b32d59261a29a6fd5e41b07ab739ca84f8e6e6a681b649eeb71f77b0bd0d8616672c3840459ba541299e3c0491cb1eb4a39d7f01c2a2c5593d3141c",
    "signer": "0x729c61b59A882B38AF14E5b4c9EA7b3B9e835700",
    "userId": "669128768"
  }
}