I know that fairly recently Japan issued rules on CryptoExchange registration:
http://www.so-law.jp/wp-content/uploads/2017/07/Japanese_VC_Act_and_Registration-Overview_170704.pdfAlso there is some set of rules of licensing in NewYork:
https://en.wikipedia.org/wiki/BitLicenseAre there other guidelines available in countries like HongKong, Singapore, UK, EU, US (other than NY) et.c.?
How exactly Exchanges like Bittrex, whos income is 100% consists from BTC/Altcoin comissions pay their taxes?
How they even calculate their taxes for earned BTC? (for example say Bitfinex perform operation with comission of 0.001 BTC between user in Russia and Singapore on a platform located in HongKong by legal entity registered in British Virgin Islands. Will that income be taxable and most important - where it will be taxable?)
How Exchange can cash out their earned BTC? Isn't dumping their own BTC on their own platform breaks some ethics (if not actual) laws?
