'An In-Depth Look at Blockchain Validation ' blockchain pos
Notice two core components of this view:
, in practice this requires everyone to agree on the switch at the same time, and this is often very very hard.. We are using the friction that coordination problems create as a bulwark against malfeasance by centralized actors. We can build systems that have property X, and we can guarantee that they will preserve property X because changing the rules from X to not-X would require a whole bunch of people to agree to update their software at the same time.
A fraud proof in its simplest form works as follows. Typically, a single block in a blockchain only touches a small portion of the blockchain "state" . If a fully verifying node processes a block and finds that it is invalid, they can generate a package containing the block along with just enough data from the blockchain state to process the block. They broadcast this package to light clients.
This is what auditability usually means in the real world: not that everyone is verifying everything all the time, but that there are enough eyes on each specific piece that if there is an error it will get detected, and when an error is detected that fact that be made clear and visible to all.
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