The U.S. Department of Justice has sentenced a Texas-based early Bitcoin investor to prison for filing false tax returns. The individual purchased a significant amount of Bitcoin in 2015 and later sold a portion of it for a significant profit. However, he underreported his capital gains on his tax return and failed to report the transaction to the IRS on several other occasions. This resulted in a substantial tax liability, leading to his conviction and sentence. The case highlights the importance of proper tax reporting for cryptocurrency transactions and serves as a warning to investors who may be tempted to evade taxes on their digital asset gains.