{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x43438261acaddfa212f68f26b335d35042c39f4249fa13e70145b3facbd509c2",
    "signature": "0xec47c0f47f23a139b0a343114818e28f1ad8fb1f8c2b831e8bd7403f2c20b0347be0263e89440eaa3089d2261e9d180f11c49e78621c748d29e9b67777f7d8e41b",
    "signer": "0xf79450e70C7132D92f91A33eFCA686b1887B6C9C",
    "userId": "779265865"
  }
}