Coinmama
Founded in 2013, Coinmama now offers our trusted services to more than 188 countries worldwide, and is considered one of the easiest, fastest and safest way to buy bitcoin and ether using a credit or debit card.
Who helps keep a crypto network running? Some computers on the network have a special role called validators. They check and confirm transactions and help decide which ones are valid. They follow the same rules as everyone else. Different networks use validators in different ways.
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