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2/ 🧵 Cryptocurrency networks, such as Bitcoin and in the pas Ethereum, use a process called mining to secure and validate transactions. Mining involves solving complex mathematical puzzles using computational power.

3/ 🧵 51% Attack , Mining Pool Centralization , Miner Collusion

4/ 🧵Proof of Stake (PoS) is a consensus mechanism used in blockchain networks to achieve agreement on the state of the blockchain and validate transactions.