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Using `Arc<Mutex<HashMap<K, V>>>` is often not ideal in Rust due to contention, deadlocks, and performance concerns. For concurrent access patterns, consider using DashMap or RwLock instead, as they provide better performance through finer-grained locking or lock-free mechanisms
Dựa theo link: https://blog.getreu.net/20241005-how_to_shallow_clone_a_cow-blog/
While it is true that Bitcoin is often deemed the father of cryptocurrencies as many consider it to be the first-ever cryptocurrency, there are many other coins that are considered its predecessor. Before Bitcoin, there were many attempts at creating cryptocurrencies like Blinded Cash, DigiCash, B-Money, Bit Gold, Hashcash, and more. Nevertheless, none of those attempts measure up to Bitcoin’s success or leverage.
