{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5a352b85848d110ca74af53d0c9ce9039c4990d56c1af6d1a770f938e802e41d",
    "signature": "0x4e4e52941201f80ebf152f43c4b28e322947ad31ae12acc80a053a192acec88a19f4e4aaf477f3d6c493fe0edcd5cf29ded512e0492964f46686776f1bb15ed61c",
    "signer": "0xFeA5bc7239fee611C512dE588FA68Aee47B94040",
    "userId": "323807960"
  }
}