There are a couple of reasons for using a hot wallet, but the most common reason is that bitcoin hot wallets are the easiest to access when using bitcoin as a currency or when making frequent trades or https://youtu.be/4VuiaJffeWM transactions. Its flexibility to adopt all the benefits of fiat currency makes it an exclusive one among all the other cryptocurrency. Last year when Mizuho became one of the 25 banks which have joined R3CEV consortium for distributed ledger technology. It made a big news when the largest bank of Japan made its own cryptocurrency, named "MUFG coin" while doing research about blockchain and distributed ledger technology. Japanese SBI Sumishin Net Bank in conjunction with Nomura Research Institute is all set to implement blockchain financial technology.
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