Check this message from the 🗿｜faq channel https://discord.com/channels/793094838509764618/893051131440295966/1017144940305846352 
as far as video resources go, the starknet workshop series and encode videos from the first hackathon earlier this year are great and you can find them on youtube.
I think solidity and cairo compliment each other and you can hear henri's opinion about it here https://youtu.be/UoL4KGP_KVA?t=3794

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

Newton

Hello everyone. Does anyone happen to know if there's a way to get the block hash in cario? I found out about `get_block_number` and `get_block_timestamp`, but is there something similar for block hash?

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

How to get the block hash in 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 ?


Some questions that could be answered separately.

1. The only way to invoke a contract is using migrations (this applies for both devnet and testnet?)
2. When doing a migration file I receive the “Hint is not whitelisted. This may indicate that this library function cannot be used in StarkNet contracts.” error. For example for this code:

```
%lang starknet

@external
func up() {
    %{
        contract_address = deploy_contract(
             "./build/main.json",
             config={"wait_for_acceptance": True}
        ).contract_address

        invoke(
            contract_address,
            "initialize",
            {"new_authority": 123},
            config={
                "auto_estimate_fee": True,
                "wait_for_acceptance": True,
            }
        )
    %}

    return ();
}
```

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

The only way to invoke a contract is using migrations (this applies for both devnet and testnet?)

Hi everyone, I have a technical question:

We know that L2s are taking transaction load off of the Ethereum, but how is that process taking place? Is there a threshold of optimum transaction speed/cost? Are L2s only intervening when the L1 is congested or that threshold is passed?

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

 Is there a threshold of optimum transaction speed/cost in L2s?

I made an example using [this library with react](https://github.com/fracek/starknet-react-example), everything is working fine in development, but in production, it looks like starknet.js is throwing a type error. You can [open this page](http://starknet-react-example.vercel.app/) to see the error more in detail.

To reproduce locally:

- Clone my example repo
- Build with `yarn run build`
- Serve production build with `yarn run serve`

Based on this [Github thread](https://github.com/0xs34n/starknet.js/issues/37)

How do I use Create React App in StarknetJS?

How do I get the function selector or the hash from the function name in Cairo?


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/627)_

Cairo: Getting function selector

I'm implementing the new version and had a couple Q's:

- Is `useStarknetExecute` now the only transaction method (for multi and single calls).
- Do we update the transaction manager on our end? I seem to remember `useStarknetInvoke` also update this automatically

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

Questions about useStarknetExecute. Do we update the transaction manager on our end? [StarkNet/Cairo]

Hey, while using hardhat test, do we have to manually compile all the contracts again? Bcz if I don’t, it’s still using old compilation and not new contract changes.

Just trying to understand if there is a better way. In solidity, it used to auto compile and that too only changed contracts.

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