Proof-of-Stake

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As of this writing, the Ethereum “Merge,” one of the most anticipated events in blockchain history, is finally expected to occur in September 2022. The “Merge” will shift the Ethereum blockchain (native token ETH, or ether) from a proof-of-work (PoW) consensus mechanism to a proof-of-stake (PoS) consensus mechanism that uses over 99.9% less energy. Technically, the Merge involves transitioning the current Ethereum proof-of-work Mainnet protocol (the blockchain used for ETH-based transactions) to the Beacon Chain proof-of-stake network.  As a result, transactions will be conducted on the new proof-of-stake network and new ETH tokens will be minted by nodes on the network staking a fair amount of ether tokens into a pool to secure the network and validate transactions. Post-Merge, the practice of ether cryptomining on the Ethereum 2.0 network will end, either forcing miners to pivot to mining on Ethereum Classic or find a new endeavor.

While the move to Ethereum 2.0 is being closely-watched, akin to the countdown to the New Year’s Eve Times Square ball drop, it’s a little more complicated and more of a series of actions (and accompanying benefits) that will happen over time. The Merge is but the first step in a series of five (notably followed by upgrades titled ‘the Surge,’ ‘the Verge,’ ‘the Purge,’ and ‘the Splurge’) that intend to make Ethereum faster, more scalable, more powerful, more energy efficient and more robust.

Once purely theoretical, “majority” or “51%” attacks on public blockchains have dealt participants a reality check: The fundamental assumption of Satoshi Nakamoto’s 2008 Bitcoin whitepaper (that computing power will remain sufficiently decentralized in blockchain networks that rely on a “proof-of-work” consensus mechanism) can in practice actually be exploited to enable double spending.

“The system is secure as long as honest nodes collectively control more CPU power than any cooperating group of attacker nodes…. If a majority of CPU power is controlled by honest nodes, the honest chain will grow the fastest and outpace any competing chains. To modify a past block, an attacker would have to redo the proof-of-work of the block and all blocks after it and then catch up with and surpass the work of the honest nodes.” – Satoshi Nakamoto, Bitcoin: A Peer-to-Peer Electronic Cash System

These incidents have provided opportunities for developers of both public and private blockchains, as well as operators of blockchain-based digital asset trading platforms, to learn from the first generation of blockchain deployments.