UTXO Chains
                    Unspent Output,Cash model
                    Stateless; tracks unspent outputs like digital
                        coins. 
                        Balances sum unused UTXOs. 
                        Transactions destroy/create UTXOs. 
                        Parallel verification possible.
                        Script-based (non-Turing complete), limiting smart contracts.
                        Better privacy via address rotation.
                        Atomic transactions.
                        Fees based on size (bytes).
                        Ideal for payments (Bitcoin, Litecoin).
                        Minimal state overhead.
                 
                
                    EVM Chains
                    Account-Based
                    Stateful, globally shared state. 
                        Balances stored per account.
                        Transactions trigger state changes via smart contracts.
                        Turing-complete EVM enables complex dApps.
                        Gas fees pay for computation/storage.
                        Sequential execution limits scalability.
                        High composability (DeFi/NFTs).
                        Uses persistent addresses (lower privacy).
                        Dominant ecosystem (Ethereum, BSC, Polygon).
                        State explosion challenges.