The Pedersen hash function is a builtin and has its own gas costs, not counted in terms of Cairo steps. You can find more information about it here: <https://docs.starknet.io/docs/Fees/fee-mechanism/>﻿


ㅤ
_This answer was originally posted on [Triality](https://triality.org/question/1084)_

Does anyone have information about the efficiency of the Pedersen hash in terms of steps/gas?


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/1084)_

How many Cairo steps does it take to compute one Pedersen hash?

Does AA support "Burner Accounts" so I can connect a new account to a new dApp without worrying about losing all my funds?

---

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Does Account Abstraction support "Burner Accounts"?

I’m signing a message using 
```
account.signMessage(data) 
```
and immediately verifying the signature with the same data and it’s returning false. I don’t see any issue open on this subject on starknet.js. Is this something you’ve already encountered by any chance?

here’s the code:

```python
const data = { types: proposeTypes, primaryType: 'Propose', domain, message };
const sig = await user.account.signMessage(data);
let res = await user.account.verifyMessage(data, sig); // returns `false`
```

I see that’s the expected way to use signMessage through the tests (https://github.com/0xs34n/starknet.js/blob/b20819424dea824c96ac31e0542733c84d87d441/__tests__/account.test.ts#L125-L126).

So I guess something’s going wrong when it comes to either hashing the data and signing it or hashing the data and verifying the signature?


btw: for those wondering: `verifyMessage` only works if the account is deployed: if you’re doing this with an account not deployed (basically just a keypair) then this won’t work :)

signing a message using account.signMessage(data) | starknet.js

How do I connect my wallet to my Pathfinder node?

# Will Kakarot be an L3 on top of the Starknet validity rollup?

Will Kakarot be an L3 on top of the Starknet validity rollup?

How does warp handles the contract solidity version?


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 ();
}
```

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

Hi ! Is there something going on the testnet? The block time remains the same, but I have to wait several dozen minutes for my transactions to be accepted

And so, most of the time, the gas price changes a lot between the moment I send the transaction, and its execution, thus I'm getting the `Actual fee exceeded max fee` error quite often

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

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How many Cairo steps does it take to compute one Pedersen hash?

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