hi thanks for your effort! pls check this StarkNet technical docs page(hash functions and transaction structure). it may help your understanding 🙂

https://docs.starknet.io/docs/Hashing/hash-functions

https://docs.starknet.io/docs/Blocks/transactions

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

Newton

gm all! I am working on this project https://github.com/outsider-analytics/ZK-Circuit-Performance-and-Security-Data on a grant from the EF PSE team.  I need to understand what hash types are being used in the STARK proof creations.  I have poured through the docs and can't seem to find it.  I have seen reference to Pedersen and Rescue, but can't find anything definitive.  Can someone point me towards any documentation that can help me?

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

Can anyone point me to Pedersen, Rescue references? StarkNet / Cairo Lang

Hi, 
Would anyone have a link or know how fast blocks would be generated on StarkNet after Regenesis ?
I am working on a project where I mint an NFT which can be burnt to mint other NFTs. Hence, I'd like to know how much minimum time there will be between these two mints transactions.

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

Would anyone have a link or know how fast blocks would be generated on StarkNet after Regenesis ?


What are steps to create a new contract using starknetjs?

Does Kakarot zkEVM have a token?

What are multi-calls in Account Abstraction? What will it bring to the UX?

Hello! This is day 10 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 “Bitwise operations”.  Perhaps you can help me?

```
// The bitwise builtin allows you to perform bitwise operations
// (and, or, xor) on integers up to 251 bits.
//
// The following code implements the function xor_last_hex_digits,
// which takes the two last hexadecimal digits and "xor"s them.
// For example, in 0x1234 the last two digits are 3 and 4,
// and their xor is 3^4=7.
//
// Fix the missing code and make sure it works.

%builtins bitwise

from starkware.cairo.common.bitwise import bitwise_and, bitwise_xor
from starkware.cairo.common.cairo_builtins import BitwiseBuiltin

// Returns the xor of the last two hexadecimal digits.
func xor_last_hex_digits{bitwise_ptr: BitwiseBuiltin*}(x: felt) -> (res: felt) {
    // Fix and uncomment the line below.
    // let (digit0) = ...

    let (shifted_digit1) = bitwise_and(x, 0xF0);
    tempvar digit1 = shifted_digit1 / 0x10;

    return bitwise_xor(digit0, digit1);
}

func main{bitwise_ptr: BitwiseBuiltin*}() {
    let (res) = xor_last_hex_digits(0x1234);
    assert res = 7;

    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)*

How to make Bitwise operations in Cairo Lang using %builtins bitwise, bitwise_xor?

# Hello starknet fam!

I heard with the last release of protostar it is now possible to make multiple call to different contracts functions in one protostar invoke CLI.

Can someone show me a good exemple on how to use it?

Like multicall with approve and swap.

Thank you very much!

How to use multicall with protostar 0.9.0?

How can I interact with my contract on Starknet using starknetjs?

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Can anyone point me to Pedersen, Rescue references? StarkNet / Cairo Lang

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