Bitcoin is an illusion created via numbers and word(BTC). It doesn't really exist. Here you have all explained: https://youtu.be/4rWmOq0o1hM
Man, if BTC is an illusion, it can't be tradable and it won't have value. 
It is the fact that BTC is a digital coin and it has value. If it is only an illusion, no one wants to use BTC as a digital asset or a digital currency.
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Bitcoin is really not an illusion because first, a lot of people are participating to make Bitcoin work, computer power, which we called bitcoin mining, helps the Bitcoin network runs. Peer-to-peer.
Second, more than 10 years and Bitcoin is still here, created multiple all-time highs since it was created.