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Blackcoin is a peer-to-peer cryptocurrency that launched in 2014 and was one of the early adopters of proof-of-stake consensus, offering faster and more energy-efficient transactions compared to proof-of-work systems. The coin emphasizes privacy, security, and community governance, with features designed to enable fast payments and smart contracts on its blockchain. Blackcoin distinguishes itself through its focus on sustainable mining via staking rewards rather than traditional mining, making it an environmentally conscious alternative to many other cryptocurrencies.