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17-Aug-2015 21:14

This makes sense, because it does not really needs to know what the function actually does, it only needs to know the signature.

You might need to update drivers in Windows when a new piece of hardware you've installed doesn't work automatically or maybe after upgrading to a new version of Windows.

After that is done, there is no way to change the code, and there is no way to update the database except through that code. A potential problem is that we might want to replace this address later, or even the entire validation procedurer, but we can’t because of how code and storage works.

A simple way of making the contract more flexible is to store the current owner address in storage instead, and make it possible to change. First we move the account validation code into a different contract. Everything that has to do with access control is now delegated to the validator contract.

Another thing to keep in mind is that modularity comes with a cost, because it requires more code, storage variables and calls. The large, expensive contracts in an excessively modular system can after all be improved and replaced, but if the contracts are locked down that may not be an option.

On the public chain, where the gas limitations are quite severe (for obvious reasons), even a small modular system could be hard to deploy and run. In our opinion, it is very important to at least acknowledge that the code is going to need updates, and at some point there must be a good policy for how it can be done. And then maybe fail again, and again, until eventually it becomes clear.

You might need to update drivers in Windows when a new piece of hardware you've installed doesn't work automatically or maybe after upgrading to a new version of Windows.After that is done, there is no way to change the code, and there is no way to update the database except through that code. A potential problem is that we might want to replace this address later, or even the entire validation procedurer, but we can’t because of how code and storage works.A simple way of making the contract more flexible is to store the current owner address in storage instead, and make it possible to change. First we move the account validation code into a different contract. Everything that has to do with access control is now delegated to the validator contract.Another thing to keep in mind is that modularity comes with a cost, because it requires more code, storage variables and calls. The large, expensive contracts in an excessively modular system can after all be improved and replaced, but if the contracts are locked down that may not be an option.On the public chain, where the gas limitations are quite severe (for obvious reasons), even a small modular system could be hard to deploy and run. In our opinion, it is very important to at least acknowledge that the code is going to need updates, and at some point there must be a good policy for how it can be done. And then maybe fail again, and again, until eventually it becomes clear.A very important property of EVM contracts is that when a contract has been uploaded to the chain, the code can never be changed.