After reading a lot of perma-bullish postings in this speculation forum, I only want to issue a little warning. Not as a professional trader, but a guy that has been here since 2013.
Be careful! I think we are near the top of a bubble. Don't invest what you cannot afford to lose.That is valid for Bitcoin and most altcoins at the same time. I think we have overheated - mostly due to the speculation on the Segwit activation - and now we must go down a bit. Probably the rest of the year will be bearish or a sideways market.
What doesn't that "warning" mean?- It doesn't mean that Bitcoin will go instantly to zero. My prediction is that it will go to $3000, until late October but then, depending on the news, we can go lower (in a worst case scenario, to about $1000).
- It doesn't even mean that $4970 was the top (although I consider it likely). There could be another bullish "leg". But it will most likely be the last one of the year, and I don't think it will reach $10.000.
- It does not mean that "Bitcoin is a bubble". Bitcoin is useful and a great project. But it cannot increase permanently in price. Sometimes there is profit taking, or also a little bit of panic.
Why do I think that the "bubble" ended?- Bitcoin's price has increased about 30 times in this bullish cycle which started in late 2014 at $135. That is HUGE.
- Adoption by retailers and other real world shops has not increased according to the price increase (in fact, I think we're at the same level than in 2013/14).
- China has strongly restricted ICOs a few days ago. That will lower the demand a bit, although it's not catastrophic, maybe.
- In November, there could be a dangerous hard fork, separating the main development team (Bitcoin Core) from a large part of the Bitcoin economy (miners, Bitpay, Coinbase) on different chains.
Draw your own conclusions. I'm a bit in bearish mood now. I'm still a long term bull
I think the moral of this post is that we see a lot of people in this forum, especially newbies, getting too excited about rising prices. Those are the first to panic and sell after the first dip. This is a highly volatile market and it is even more volatile for most altcoins. Every investor should be aware of that and not be surprised if it goes down as fast as it goes up.