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There are also several examples of off-chain collateralized stablecoins. The most popular ones are USDT and USDC, both USD-backed stablecoins. They are both available as ERC-20 tokens on the Ethereum blockchain. DGX is an ERC-20 based stablecoin backed by gold, and WBTC is a tokenized version of Bitcoin, making Bitcoin available on the Ethereum blockchain.
From Decentralized Finance: On Blockchain- and Smart Contract-Based Financial Markets | St. Louis Fed:
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