When asked, “What exactly is the EVM, and what does ‘EVM-compatible’ mean?” I usually answer: The EVM is a stack-based virtual machine. Each data unit (word) is 256 bits, and the maximum stack depth is 1024. The EVM charges gas for each instruction. When a transaction runs out of gas, it halts and rolls back state changes, so an infinite loop can’t stall the entire network.
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