Yahoo Finance

$3.2 trillion in bitcoin payments processed in 2018.

https://finance.yahoo.com/news/3-2-trillion-bitcoin-payments-074536897.html

Wall Street Journal

Wild west of bitcoin options.

https://www.wsj.com/articles/could-bitcoin-hit-50-000-in-wild-world-of-crypto-options-some-say-yes-11559559601

Forbes

Altcoin market rally.

https://www.forbes.com/sites/cbovaird/2019/03/06/how-litecoin-prices-practically-doubled-this-year/#776da1256ebb

International Business Times

Bitcoin in emerging markets.

https://www.ibtimes.com/lets-help-emerging-markets-show-bitcoins-value-world-2777572

ChinaZ

Bitcoin trading volume passes $2 trillion in 2018.

CoinTelegraph

Bitcoin market analysis.

NewsBTC

BTC/USD market overview.