Key Takeaways Vitalik Buterin has said that he is “worried” about Bitcoin’s future. The Ethereum creator pointed to Bitcoin’s fee model and Proof-of-Work consensus mechanism, saying that they could leave Bitcoin vulnerable to attack in the long-term future. Buterin also defended Proof-of-Stake ahead of Ethereum’s upcoming “Merge” and shared his thoughts on crypto’s recent bull market. Buterin also gave his thoughts on some criticisms leveled at Proof-of-Stake ahead of Ethereum’s upcoming “Merge” event.  Fears Over Bitcoin’s Future   Vitalik Buterin is concerned about Bitcoin’s future.  In a September 2 interview with economics writer Noah Smith, the Ethereum creator…