All the users in the world control Bitcoin. Developers are unable to force a change in the Bitcoin protocol; however, they can improve the software. Various versions of softwares are free for customers to use, which gives incentive to developers to create new and improved software that can attract users. All software based users follow the same transaction guidelines allowing the system to work in harmony, and ensuring that it runs as effectively as possible. Hence, these guidelines are upheld by every single users and developers in an effort to ensure system stability.
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