Secret String

Secret String blocks are functionally equivalent to regular String blocks in that both of these block types serve to allow the graph developer to enter string data into the graph.
The difference is that the contents of Secret String blocks are hidden, like "••••••••••". They also cannot be copied to the clipboard.
This is useful when building graphs that others will have access to that contain sensitive information, like a Discord account token or a Binance API secret key.
In the example above, we use a Timer block to check the price of Bitcoin on Binance once every minute. We then use a Decimal Branch block to check if the price is below $28,000; if it is, we place a market buy order for 1% of a Bitcoin with a Place Market Buy Order block, and then we terminate execution with a Stop Graph block.
The Secret String blocks are used here when setting up the Binance Connectorblock with its API key inputs. We could have used regular String blocks here, but since Binance API keys are sensitive (especially the "ApiSecret" parameter) it makes sense to secure our graph by using Secret String blocks. This way, having access to this graph file isn't equivalent to knowing our Binance access credentials.