The bitcoin virtual currency whose value fluktuaktif, where most of the exchange rate is affected by the news. In recent days bitcoin prices decline, and from the news I know is 1. secretly meeting between miners and developers bitcoin. 2. one bitcoin exchange site, bitfinex been hacked and resulted 119.756btc missing. 3. The effect of halving. 4. European regulation. 5. no decisions regarding the size of the block bitcoin.