Thanks --- I'm not sure I've seen a lib that implements it. https://docs.soliditylang.org/en/latest/abi-spec.html#non-standard-packed-mode should help if you want to give it a shot

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

Newton

Hey guys, quick question. What should I use to execute abi.encodePacked from solidity in starknet?

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

What should I use to execute abi.encodePacked from solidity in starknet?

How do I connect my DAPP to Starknet mainnet using starknetjs?

Hello, anyone able to advise what the etherscan equivalent for starknet is ?

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

What the etherscan equivalent for starknet is ?

Looking to call the approve and transfer functions for an erc-20 in the same transaction. Thoughts on how to do this?


ㅤ
_This question was originally posted on [Triality](https://triality.org/question/1218)_

Cairo: How can i approve erc20 and transfer in the same transaction?

Hello guys, does one know how to modify keccak.cairo and/or packed_keccak.cairo to compute a 512bits keccak hash instead of 256 bits?

I'm following a paper that needs 256 bits collision resistance so i need 512 bit keccak. 

There should only a few parameters to change but its quite hard to find them in the Cairo code 

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---

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How to modify keccak.cairo and/or packed_keccak.cairo to compute a 512bits keccak hash instead of 256 bits?


### How to fix this?

```python
./main.cairo:23:13: While expanding the reference 'bud_ptr' in:
    bud=bud,
            ^*****^
./main:20:9: Error at pc=0:2482:
Unknown value for memory cell at address 1:8.
```

How to fix `bud_ptr`

How do I see my Pathfinder logs?

This isn't a starknet question, but raw cairo. is it possible to use a pointer reference like let, and set it to a pointer with a hint, without doing a memory allocation?

looks like the answer is yes, but you do need to assign a reference when you declare a pointer reference with let, but that doesn't alter the memory

e.g.

```python
let s : felt* = cast(ap, felt*)
{
	ids.s = some_other_reference
}
```

the `cast(ap, felt*)` does nothing, just satisfies the compiler by having something on the rhs of a let

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What should I use to execute abi.encodePacked from solidity in starknet?

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