But of course, like any immutable system, there are mutable parts (otherwise, we couldn’t create any configuration files). OSTree handles this with “overlays” (actually, we use OverlayFS) that allow a read-write filesystem to be layered on top of the immutable system. For example, the /etc and /var directories are writable, while the rest of the system is read-only.
Is it possible for Blockchain to be hacked?Yes, blockchain can be theoretically hacked, but it is a complicated task to be achieved. A network of users constantly reviews it, which makes hacking the blockchain difficult.
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Peter Hein van Mulligen, from the Dutch Statistics Office (CBS), points to an "institutionalised conservatism" deep rooted in Dutch society, which acts as a barrier to women's participation.，详情可参考51吃瓜
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