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Provide an Example of a Cryptocurrency That Utilizes a BFT-variant Consensus.

One prominent example is Ripple (XRP Ledger), which uses the Ripple Protocol Consensus Algorithm (RPCA), a form of BFT. Another is Cosmos, which utilizes the Tendermint BFT consensus engine.

These systems are chosen for their high transaction throughput and fast finality, making them suitable for cross-border payments and other high-speed financial applications. Ethereum 2.0's Beacon Chain also incorporates a BFT-like mechanism called Casper FFG for finality.

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