Bitcoin's (BTC-USD) "extreme volatility, high transaction costs, and its troubling carbon footprint have been major obstacles to its widespread use for payments," Deutsche Bank analyst Marion Laboure writes in a note to clients. In regards to the Bitcoin (BTC-USD) network's transaction speed, the digital coin can only process up to seven transactions per second. By comparison, Visa can handle up to 24K transactions per second. Bitcoin's volatility speaks for itself as the price has fallen about 15% from a record high of $69.3K on Nov. 10 to $60.4K as of now. In addition, Laboure says Bitcoin (BTC-USD), the world's largest digital token by market cap, isn't ready for mainstream use as a payments instrument due to the security of digital wallets. "Unlike a lost credit card, which can easily be replaced without financial loss, a lost digital access key to a Bitcoin digital wallet can make it impossible to access the account,"