Bitcoin ushers in fourth halving as miners' block subsidy reward drops to 3.125 BTC The BlockBitcoin just completed its fourth-ever 'halving,' here's what investors need to watch now CNBCBitcoin Blockchain Has Fourth 'Halving' in 15-Year History, in Show of Monetary Policy Set by Code CoinDeskBitcoin Risks Another 'Sell-the-News' Market Move After Halving Bloomberg