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A cryptocurrency or a category of cryptocurrencies that are an alternative to bitcoin. Many altcoins project themselves as better alternatives to bitcoin in various ways (e.g. more efficient, less expensive, etc.).
It is a software that acts like an intermediary or a bridge that lets two applications talk to each other. It is the one that lets applications, data and devices interact.
A type of digital signature performed in a group where it becomes impossible to determine which member's key in the group were used for the digital signature.