Blockchain 101 – Basics Part 4 – Consensus Mechanisms In the last article, we learned how nodes verify transactions and maintain copies of the ledger. Now, it’s time to see how the network decides which transactions are valid and which blocks get added this is consensus mechanisms.

What is Consensus and Why It Matters? Consensus is how nodes agree on a single source of truth. Without it: Transactions could be double-spent. Blocks might conflict and the network could break. Example Odin wants to send 0.01 BTC to Vahid. Filsoof and Emad run their nodes to check that the transaction is valid. The network must reach agreement before the block is added. Consensus ensures network security and trust, even when no single party controls everything.

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