A cryptocurrency is a digital or virtual currency that is secured by cryptography, which makes it nearly impossible to counterfeit or double-spend.
https://sites.google.com/metam....skio.com/metamaskext
https://sites.google.com/coins....logs.com/coinbase-ex
https://sites.google.com/crypt....ocomlgin.com/cryptoc
https://sites.google.com/metam....skio.com/metamask-ex