Centralized exchanges are developed while Decentralized exchanges are developing
Most exchanges I am now using is Centralized (Bittrex, Binance) but I prefer DEX and I hope Decentralized exchanges will be more popular in a near future

Arcblock is advertising as blockchain 3.0 generation (Bitcoin = blockchain 1.0; Ethereum = blockchain 2.0).
Many other coins said that They are blockchain 3.0
Let's see what Arcblock can do.

Look like I missed a good ICO.

Hold altcoin will give much more profit than hold bitcoin.
Here is my list:
- Ethereum: the most stable coin
- Ripple:
- Siacoin:
- Dogecoin: (I bought it last year at 16-20 sats)
- CyberMiles: Keep at Binance until die

If you strongly believe that is a really good project (good coin/ token), you should hold at least 1 year to multiply your profit
Otherwise, sell it all.

Coins have their own blockchain, such as: Bitcoin, Ethereum, Litecoin, ...
While Token are born from another coin (platform coin, such as: Ethereum, Wave, Neo...). Tokens has not their own blockchain yet. Token usually used at ICO stage