for more details questions related to ArgentX, pls use their official server 🙂

https://discord.gg/argenthq

_This answer was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Newton

Hey everyone, is it possible to use argentx to sign in/authenticate user to a off-chain api/db

What I want to do is store some data off chain for each user(wallet)

I have seen that metamask/etherem has 'personal_sign' rpc method that can be used for something like this

Is there anything like this available in starknet ecosystem?

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Is it possible to use ArgentX to sign in user to a off-chain api/db?

How do I call a test account while trying to test a function?



ApeWorX: How do I call an account while trying to test a function?

Hello! This is day 4 of the 17 days of the Cairo Challenge. And I have no idea how to solve the [playground](https://www.cairo-lang.org/playground/) exercise “Variables”. Can you launch this code with the instructions and write down how many steps the program has in the output?

[BONUS]: try to make it faster

```
// The following code outputs the 9th power of 2.
// 1. Click on "Debug" to run the code, and then click on
//    the arrows in the memory panel to trace the program
//    step by step.
//
// Observe that the computation of `z` take 8 steps and
// creates 8 temporary variables. This is because `let`
// simply replaces each instance of `y` with `x * x * x`
// and each instance of `z` with `y * y * y`, which is
// expanded to nine multiplications.
//
// 2. Change the two `let`s to `tempvar`s and run the program.
//
// "tempvar" stands for "temporary variable", which means that
// a variable will be allocated for the intermediate values
// (`x * x * x` and `y * y * y`). This reduces the same
// computation to use only 4 steps and 2 new variables.
//
// 3. Replace all three instance of the keyword `tempvar`
//    with `local`, uncomment the line containing `alloc_locals`
//    and run the code again.
//
// The behavior of the code doesn't change. This is because
// the keyword `local` allocates a new variables for the
// intermediate values as well. The main difference between
// `local` and `tempvar` is explained in the next challenge.

// Use the output builtin.
%builtins output

// Import the serialize_word() function.
from starkware.cairo.common.serialize import serialize_word

// Outputs the value 2^9.
func main{output_ptr: felt*}() {
    // alloc_locals;
    tempvar x = 2;
    let y = x * x * x;
    let z = y * y * y;
    // Because of the `let`s, the following line is equivalent to
    // serialize_word(x * x * x * x * x * x * x * x * x).
    serialize_word(z);
    return ();
}
```

---

> Answers to this question are a part of the ✨ 17 days of Cairo Lang with Playground & Newton. ✨
> 

*Vote for your favorite answer - the best answer will win a $10 award. A new day – a new reward! During the next 17 days, our goal is to attract more developers to the Cairo language and to systematize the knowledge of Cairo lang. [Read rules](https://www.notion.so/17-days-of-Cairo-Lang-with-Newton-550dfcda6a2d449ca468be293c776578)*

What is the difference between tempvar/let in Cairo Lang? How to use allow_locals and local?

Hi all! I wanted to know if anyone knows by chance if the Starknet Name Service is working or not?

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

Is the Starknet Name Service working or not?

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What is an abstract account? For example: StarkNet Account Abstraction

Hi all, what are a few of the best apps to test on starknet?  thanks

_This question was originally posted on [StarkNet Discord](https://www.newton.so/view?tags=discord)_

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Is it possible to use ArgentX to sign in user to a off-chain api/db?

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