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Intro to Ethereum and Smart Contracts

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Intro to Ethereum and Smart Contracts ( intro-ethereum-and-smart-contracts )

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Figure 1.6: Proof-of-work Still, the case of a big number of malicious nodes colluding and sharing CPU power must be considered. In fact, an entity controlling a majority of the nodes (in terms of CPU power, not number) could exercise a double-spending attack by creating blocks faster than other nodes. Big enough networks rely on the difficulty of amassing CPU power. While in a voting system an attacker need only add nodes to the network (which is easy, as free access to the network is a design target), in a CPU power based scheme an attacker faces a physical limitation: getting access to more and 16

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