What I usually do to confirm this trading signal is by comparing their chart to other's chart at tradingview.com. I also analyzing the fundamental results or cryptocurrency news if it will be a bad or good news. There are some patterns to be recognized what will be the next color of candle will appear and honestly, there are different kinds of trading patterns so it will be pretty confusing specially if the fundamental results doesn't match on the technical results. The safest thing to do is to not to set too much expectation of return of investment.
Trading signals are a complicated subject when it comes to crypto currencies. There are many signals that work really well when it comes to forex trading but doesn't really work on crypto. Do you want to know the difference? Well in forex when something looks like it worths a look and buying that thing usually is good for buying, except for major political stuff (which is all the time in some countries) the price is as stable as it gets and we are talking about trillions of dollars.
When it comes to bitcoin though, even if it looks too good to buy and all signals tell you to get more of it, some crazy person like Craig come up and sell half a billion dollar worth of bitcoin in one day and you will sit there holding a bag of coins that worth less. Hence bitcoin is more volatile and risky. That's why trading signals even though are great day trading deals usually fail on long term.
But I believe there will be no need of having any extra knowledge only for the reason of trading crypto currencies. It means generating trading signals will not be a complicated one just due to the reason of crypto currency trading. It is very much similar to any other trading. But, we need in-depth knowledge about different trading signals and analysis so that we can develop our own trading strategy.
But, any signal may get failed due to randomly changing news. It is always good to avoid trading during the news hours. Because, we cannot expect all the all the traders are following fundamentals but they will listen to news and they will make decisions based on the outcome of news. That is the reason most of the time the technical analysis is going wrong.
With respect to bitcoin trading, trading signals sometimes make get failed due to the heavy manipulations by whales. When some big whale's are changing the directions of the markets, we cannot do anything with our technical analysis. But at the end of the day, only fundamental and technical analysis will win hence we should plan for long term rather than short-term trading.