{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xde4793491b13447e92e32f2737cf129ee92aa6c7373ff1f2deced90b60b594e5",
    "signature": "0xaf7d2d57e0f2fc1cc065b39d0772111a3bf3fc20fa81a63ff5c83c93df64d77e2371f860e1916db77354f9d31b4062c3eb5c35df7237ea8bd107a88d7bc260c41b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}