Consensus Process One examines the mechanism by which blockchain networks agree on a shared record without a central authority.
In a nutshell, consensus is the process by which a distributed network of independent participants, called nodes, reaches agreement on the blockchain’s current state. There is no central authority, no trusted intermediary, no single arbiter. Instead, each node independently verifies transactions according to the protocol’s rules, and the network as a whole converges on a single shared truth. In Bitcoin, this happens through Proof of Work: nodes compete to solve a cryptographic puzzle, and the first to succeed proposes the next block, which the rest of the network then verifies and accepts. In Ethereum since 2022, and in most newer protocols, the mechanism has shifted to Proof of Stake: validators are chosen in proportion to the assets they have committed, and consensus is reached through a series of attestations. What both mechanisms share is that no single actor makes the decision. Truth emerges from the interweaving of many independent decisions, each following the same rules, arriving at the same result.
