they are safe if used correctly.

this means specifically that every time there is a `Uint256` input to a function (especially if that is not a privileged function and any user can call it), you **must** call `uint256_check()` on it first. if you do that, you'll be safe and you don't have to worry about `Uint256`'s security issues.

to understand specifically why that is and how the `Uint256` functions work, you can refer to an article we wrote on the topic:
https://twitter.com/ggballas/status/1591119157034090513

if you're looking to go to mainnet with your dapp, you're welcome to consult with us for free about any security issues. we specialize in starknet:
https://gingersec.xyz/

Hey, I'm curious if uint256 variables are safe to use? They are using 2x128 bits, while a native felt uses only 252 bits. 

Can anyone explain?

Is uint256 math operators like uint256_le safe? Why do I need to use uint256_check?

does anybody have a working local setup ? I find myself having to run tests on the testnet...

I tried both nile and protostar. the problem is that I can set it up but I don't know how to get access to the accounts that are pre-loaded with ETH. new accounts that I create don't have ETH and I don't have a way to transfer ETH to them..

if anybody has a go-to setup that they can share that'd be much appreciated 🙏

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