Blockchain
A shared, append-only ledger secured by consensus.
A blockchain is a public ledger of transactions, grouped into blocks that each link to the one before. No central server controls it; the network agrees on its contents through a consensus mechanism.
Because rewriting a block would mean redoing all the work stacked on top of it, a proof-of-work blockchain gets harder to tamper with the deeper a transaction is buried.
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Pick a coin on the pools overview and open its How to Mine guide for a ready-to-run command.