Blackcoin

The first pure Proof of Stake coin (PoSV3), running since 2014. Each block rewards 1.5 BLK every ~64 seconds. With 10,000 BLK you can expect to stake roughly once a day — annual returns average 4%–8%, since only active stakers share the reward pool.
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Staking requires almost no computing power — any modern device qualifies. Blackcoin has been 100% Proof of Stake since 2014, consuming a tiny fraction of the energy that Proof of Work networks waste on mining hardware.
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Every transaction is permanently recorded on a shared, immutable blockchain. Check balances, verify blocks, or monitor live network weight at chainz.cryptoid.info/blk.
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With a 64-second block target and negligible fees, BLK reaches its first confirmation in about a minute. SegWit is now active on mainnet — smaller transactions, lower fees, and the foundation for layer-2 development.
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The full-node wallet and all software are MIT-licensed and open source on GitHub and GitLab. Blackcoin's codebase has been forked more than any other coin — a measure of its lasting influence on blockchain development.
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Run a self-custodial wallet with no account, no email, and no KYC. Your keys, your coins — transact with the same pseudonymous privacy as Bitcoin. No personal information is ever required to participate.
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