Bitcoin Unlimited is an implementation of the Bitcoin client software that is based on Bitcoin Core. Every node operator or miner can currently choose their own blocksize limit by modifying their client. Bitcoin Unlimited makes the process easier by providing a configurable option for the accepted and generated blocksize via a GUI menu. Also, it provides a user-configurable failsafe setting allowing you to accept a block larger than your maximum accepted blocksize if it reaches a certain number of blocks deep in the chain.
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