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A piece of digital value is created, called a cryptocurrency. The cryptocurrency is stored on a digital ledger, called a blockchain. All cryptocurrency transactions are tracked, stored, and fused inside the blockchain. This brings us to what has been the first key security feature — removing a transaction from a blockchain can be exceedingly difficult, which has made fraudulently obtaining currency similarly difficult. Although few cryptocurrencies other than Bitcoin are widely accepted for merchant payments, increasingly active exchanges allow holders to exchange them for Bitcoin or fiat currencies — providing critical liquidity and dogecoin logo flexibility. Since the late 2010s, big business and institutional investors have closely watched what they call the 8220;crypto space8221; too.