Vitalik Buterin and other co-founders of Ethereum launch a crowdsourcing campaign, raising $18 million via the sale of Ether (Ethereum tokens).

Mt. Gox, cryptocurrency trading exchange in Japan, files for bankruptcy following loss of nearly $480 million worth of cryptocurrency.

China announces that it does not consider Bitcoin a currency, and it should not be used to pay for real goods or services.

Germany accepts Bitcoin as a “unit of account,” which can be used for trading in the country.