Cryptocurrency Networks Diverge from Consensus Algorithms

The way cryptocurrency networks reach consensus is often misunderstood as simply 'proof-of-work' (PoW) or 'proof-of-stake' (PoS). However, each network has its own unique approach to reaching a consensus on the state of the blockchain.

Nakamoto Consensus, introduced by Bitcoin, is a stack of rules that determine who gets the next update and how competing histories are ranked. Miners compete in an unpredictable computational lottery, targeting a block about every ten minutes, with difficulty resetting every 2,016 blocks.

Ethereum replaced mining with validators and stake through its proof-of-stake (PoS) system, known as Gasper, which weighs validators' latest votes by stake to determine the leading branch. This approach produces probabilistic finality, making it increasingly difficult to reverse transactions as work stacks above them.

$BNB Smart Chain trades the mining race for speed using 45 elected validators and fast BLS voting to lock in finality. The $XRP Ledger, on the other hand, relies on Unique Node Lists (UNLs) containing validators that each server considers unlikely to collude, with participants repeatedly comparing proposed transaction sets until enough trusted validators agree.

Solana uses a proof-of-history model as a cryptographic clock, helping establish event order, while stake-weighted Tower BFT handles voting and fork selection. Tron puts 27 elected producers on a schedule, rotating through scheduled three-second turns before finality is reached. Dogecoin keeps Nakamoto Consensus but changes the machinery with Scrypt proof-of-work instead of SHA-256.