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Blockchain security

Consensus, PoW, PoS and variants
The blockchain, in order to validate transactions and ensure at the same time both decentralization and security, adopts a consensus mechanism.
As more people join this mechanism, security and decentralization are strengthened.
In order to join the most well-known networks, people are required to buy and set up expensive, costly-to-maintain hardware (Proof-of-Work) or to purchase and deposit a large sum of collateral coins (Proof-of-Stake).
That's not our case.