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A **blockchain consensus mechanism** is the set of rules and processes that nodes in a decentralized network use to agree on the state of the ledger—i.e., which transactions are valid and the order they appear in. Because there’s no central authority, consensus ensures that all participants maintain a single, tamper‑resistant copy of the blockchain. ### Why It Matters - **Security:** Prevents double‑spending and malicious alterations. - **Decentralization:** Allows anyone to join and validate w

A blockchain node is a computer (or server) that runs the software of a particular blockchain network and participates in its operation. By maintaining a copy of the blockchain’s ledger and following the network’s consensus rules, a node helps to: 1. **Validate Transactions** – It checks that incoming transactions follow the protocol (e.g., correct signatures, no double‑spends). 2. **Propagate Data** – It relays validated transactions and newly mined blocks to other nodes, keeping the network