checkpoint is a library that allows users to query event data that i heard about recently from the snapshot-x team not sure if this helps

https://youtu.be/G6e_wI9zIVA&t=36m15s

Havent looked into it
I’m curious about this as well

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

Newton

ETH blocks contain logsbloom, giving a partial indication of what events occurred in the block without the need to search every transaction receipt. Many ETH nodes and services also offer “filter” functions.

Is there a way to find events in a block without getting receipt for all transactions on Starknet? 

(I’m using starknet_py but open to any ideas)

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

Is there a way to find events in a block without getting receipt for all transactions on Starknet? 


Hello, Starknet will do Final State Reset around Q4 2022.    It means users need to create new wallet address & migrate asset to new wallet.   Old wallet address will be no longer usable after final state reset.     Is this correct?

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

Will StarkNet wallets work after Q4 2022 Final State Reset? Or do I need to create and merge a new wallet?

Is there any blockchain project contract supporting web2 scripts executable on VIa EVM?

I think it only one Tru (truebit)

Is there any blockchain project contract supporting web2 scripts executable on VIa EVM?

I am getting the following error: Cannot unpack the return value of 'is_le'. The return type is not a tuple.


This code was working for Cairo 0.9.1 but is not working any more:


`let (is_negative : felt) = is_le(x, -1)`


Does anyone know what this issue is about?


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/1104)_

Cairo 0.10.0 Error: Cannot unpack return value error

Hey guys,
I'm wondering:
- What **hashing functions** are available now with Cairo?
- What are the **advantages/disadvantages** of each, like computation, security?

So far I know some:
- [keccak](https://github.com/starkware-libs/cairo-lang/tree/master/src/starkware/cairo/common/cairo_keccak)
- Pedersen hash, which can be used to hash chain, [here](https://www.newton.so/view/63427472405280f6d1cf502d)
- [sha256 extension](https://github.com/cartridge-gg/cairo-sha256) of the starkware implementation which can Computes SHA256 of 'input'. Inputs of arbitrary length are supported.

Happy hashing :)



What hashing functions are available in Cairo? How are they secure?

Is there a way to search a block for events without using `get_transaction_receipt` for each transaction? 

For example, ETH has the `logsBloom` that helps you determine if an event was in the block.
And web3py and many providers have `filter` functions to help you find events.

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

Is there a way to search a block for events without using `get_transaction_receipt` for each transaction? 

What libraries are secure to use in the Cairo language? How to know which library is audited? 

What libraries are secure to use in Cairo?

In the following function I am presented with the following error, even though my code does not make it to this function. What am I doing wrong?


`func fill_in_row{output_ptr: felt*}(row_idx : felt, row_size : felt, curr_row : felt*) {` 


 `if (row_idx == row_size-2) {`


 `return ();`


 `}`


 `let val : felt = curr_row[row_idx-1] + curr_row[row_idx];`


 `serialize_word(val);`


 `curr_row[row_idx+1] = val;`


 `return fill_in_row(row_idx+1, row_size, curr_row);`


`}`


Error: code:80:5: While expanding the reference 'curr_row' in:


 curr_row[row_idx+1] = val;


 ^******^


code:72:73: Expected a register. Found: [fp + (-4)].


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/1156)_

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Is there a way to find events in a block without getting receipt for all transactions on Starknet?

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