There are barriers to entry, for the miners - that&#x27;s the whole point of having a closed block chain.  Nodes and addresses could be open depending on the hypothetical.<p>Mass decentralization is only a selling point for Bitcoin, but even then the Bitcoin organization (who controls the code) has authority to push a hard fork on the miners.  They won&#x27;t do it obviously (e.g. increase block size), because it would alienate their user base.<p>Miner validation can be controlled by the same organization in charge of the code, which isn&#x27;t aligned with any one competitor in the industry.